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Diffstat (limited to 'src/libslic3r/GCode/CoolingBuffer.cpp')
| -rw-r--r-- | src/libslic3r/GCode/CoolingBuffer.cpp | 749 |
1 files changed, 749 insertions, 0 deletions
diff --git a/src/libslic3r/GCode/CoolingBuffer.cpp b/src/libslic3r/GCode/CoolingBuffer.cpp new file mode 100644 index 000000000..40ccc7b09 --- /dev/null +++ b/src/libslic3r/GCode/CoolingBuffer.cpp @@ -0,0 +1,749 @@ +#include "../GCode.hpp" +#include "CoolingBuffer.hpp" +#include <boost/algorithm/string/predicate.hpp> +#include <boost/algorithm/string/replace.hpp> +#include <iostream> +#include <float.h> + +#if 0 + #define DEBUG + #define _DEBUG + #undef NDEBUG +#endif + +#include <assert.h> + +namespace Slic3r { + +CoolingBuffer::CoolingBuffer(GCode &gcodegen) : m_gcodegen(gcodegen), m_current_extruder(0) +{ + this->reset(); +} + +void CoolingBuffer::reset() +{ + m_current_pos.assign(5, 0.f); + Vec3d pos = m_gcodegen.writer().get_position(); + m_current_pos[0] = float(pos(0)); + m_current_pos[1] = float(pos(1)); + m_current_pos[2] = float(pos(2)); + m_current_pos[4] = float(m_gcodegen.config().travel_speed.value); +} + +struct CoolingLine +{ + enum Type { + TYPE_SET_TOOL = 1 << 0, + TYPE_EXTRUDE_END = 1 << 1, + TYPE_BRIDGE_FAN_START = 1 << 2, + TYPE_BRIDGE_FAN_END = 1 << 3, + TYPE_G0 = 1 << 4, + TYPE_G1 = 1 << 5, + TYPE_ADJUSTABLE = 1 << 6, + TYPE_EXTERNAL_PERIMETER = 1 << 7, + // The line sets a feedrate. + TYPE_HAS_F = 1 << 8, + TYPE_WIPE = 1 << 9, + TYPE_G4 = 1 << 10, + TYPE_G92 = 1 << 11, + }; + + CoolingLine(unsigned int type, size_t line_start, size_t line_end) : + type(type), line_start(line_start), line_end(line_end), + length(0.f), feedrate(0.f), time(0.f), time_max(0.f), slowdown(false) {} + + bool adjustable(bool slowdown_external_perimeters) const { + return (this->type & TYPE_ADJUSTABLE) && + (! (this->type & TYPE_EXTERNAL_PERIMETER) || slowdown_external_perimeters) && + this->time < this->time_max; + } + + bool adjustable() const { + return (this->type & TYPE_ADJUSTABLE) && this->time < this->time_max; + } + + size_t type; + // Start of this line at the G-code snippet. + size_t line_start; + // End of this line at the G-code snippet. + size_t line_end; + // XY Euclidian length of this segment. + float length; + // Current feedrate, possibly adjusted. + float feedrate; + // Current duration of this segment. + float time; + // Maximum duration of this segment. + float time_max; + // If marked with the "slowdown" flag, the line has been slowed down. + bool slowdown; +}; + +// Calculate the required per extruder time stretches. +struct PerExtruderAdjustments +{ + // Calculate the total elapsed time per this extruder, adjusted for the slowdown. + float elapsed_time_total() { + float time_total = 0.f; + for (const CoolingLine &line : lines) + time_total += line.time; + return time_total; + } + // Calculate the total elapsed time when slowing down + // to the minimum extrusion feed rate defined for the current material. + float maximum_time_after_slowdown(bool slowdown_external_perimeters) { + float time_total = 0.f; + for (const CoolingLine &line : lines) + if (line.adjustable(slowdown_external_perimeters)) { + if (line.time_max == FLT_MAX) + return FLT_MAX; + else + time_total += line.time_max; + } else + time_total += line.time; + return time_total; + } + // Calculate the adjustable part of the total time. + float adjustable_time(bool slowdown_external_perimeters) { + float time_total = 0.f; + for (const CoolingLine &line : lines) + if (line.adjustable(slowdown_external_perimeters)) + time_total += line.time; + return time_total; + } + // Calculate the non-adjustable part of the total time. + float non_adjustable_time(bool slowdown_external_perimeters) { + float time_total = 0.f; + for (const CoolingLine &line : lines) + if (! line.adjustable(slowdown_external_perimeters)) + time_total += line.time; + return time_total; + } + // Slow down the adjustable extrusions to the minimum feedrate allowed for the current extruder material. + // Used by both proportional and non-proportional slow down. + float slowdown_to_minimum_feedrate(bool slowdown_external_perimeters) { + float time_total = 0.f; + for (CoolingLine &line : lines) { + if (line.adjustable(slowdown_external_perimeters)) { + assert(line.time_max >= 0.f && line.time_max < FLT_MAX); + line.slowdown = true; + line.time = line.time_max; + line.feedrate = line.length / line.time; + } + time_total += line.time; + } + return time_total; + } + // Slow down each adjustable G-code line proportionally by a factor. + // Used by the proportional slow down. + float slow_down_proportional(float factor, bool slowdown_external_perimeters) { + assert(factor >= 1.f); + float time_total = 0.f; + for (CoolingLine &line : lines) { + if (line.adjustable(slowdown_external_perimeters)) { + line.slowdown = true; + line.time = std::min(line.time_max, line.time * factor); + line.feedrate = line.length / line.time; + } + time_total += line.time; + } + return time_total; + } + + // Sort the lines, adjustable first, higher feedrate first. + // Used by non-proportional slow down. + void sort_lines_by_decreasing_feedrate() { + std::sort(lines.begin(), lines.end(), [](const CoolingLine &l1, const CoolingLine &l2) { + bool adj1 = l1.adjustable(); + bool adj2 = l2.adjustable(); + return (adj1 == adj2) ? l1.feedrate > l2.feedrate : adj1; + }); + for (n_lines_adjustable = 0; + n_lines_adjustable < lines.size() && this->lines[n_lines_adjustable].adjustable(); + ++ n_lines_adjustable); + time_non_adjustable = 0.f; + for (size_t i = n_lines_adjustable; i < lines.size(); ++ i) + time_non_adjustable += lines[i].time; + } + + // Calculate the maximum time stretch when slowing down to min_feedrate. + // Slowdown to min_feedrate shall be allowed for this extruder's material. + // Used by non-proportional slow down. + float time_stretch_when_slowing_down_to_feedrate(float min_feedrate) { + float time_stretch = 0.f; + assert(this->min_print_speed < min_feedrate + EPSILON); + for (size_t i = 0; i < n_lines_adjustable; ++ i) { + const CoolingLine &line = lines[i]; + if (line.feedrate > min_feedrate) + time_stretch += line.time * (line.feedrate / min_feedrate - 1.f); + } + return time_stretch; + } + + // Slow down all adjustable lines down to min_feedrate. + // Slowdown to min_feedrate shall be allowed for this extruder's material. + // Used by non-proportional slow down. + void slow_down_to_feedrate(float min_feedrate) { + assert(this->min_print_speed < min_feedrate + EPSILON); + for (size_t i = 0; i < n_lines_adjustable; ++ i) { + CoolingLine &line = lines[i]; + if (line.feedrate > min_feedrate) { + line.time *= std::max(1.f, line.feedrate / min_feedrate); + line.feedrate = min_feedrate; + line.slowdown = true; + } + } + } + + // Extruder, for which the G-code will be adjusted. + unsigned int extruder_id = 0; + // Is the cooling slow down logic enabled for this extruder's material? + bool cooling_slow_down_enabled = false; + // Slow down the print down to min_print_speed if the total layer time is below slowdown_below_layer_time. + float slowdown_below_layer_time = 0.f; + // Minimum print speed allowed for this extruder. + float min_print_speed = 0.f; + + // Parsed lines. + std::vector<CoolingLine> lines; + // The following two values are set by sort_lines_by_decreasing_feedrate(): + // Number of adjustable lines, at the start of lines. + size_t n_lines_adjustable = 0; + // Non-adjustable time of lines starting with n_lines_adjustable. + float time_non_adjustable = 0; + // Current total time for this extruder. + float time_total = 0; + // Maximum time for this extruder, when the maximum slow down is applied. + float time_maximum = 0; + + // Temporaries for processing the slow down. Both thresholds go from 0 to n_lines_adjustable. + size_t idx_line_begin = 0; + size_t idx_line_end = 0; +}; + +std::string CoolingBuffer::process_layer(const std::string &gcode, size_t layer_id) +{ + std::vector<PerExtruderAdjustments> per_extruder_adjustments = this->parse_layer_gcode(gcode, m_current_pos); + float layer_time_stretched = this->calculate_layer_slowdown(per_extruder_adjustments); + return this->apply_layer_cooldown(gcode, layer_id, layer_time_stretched, per_extruder_adjustments); +} + +// Parse the layer G-code for the moves, which could be adjusted. +// Return the list of parsed lines, bucketed by an extruder. +std::vector<PerExtruderAdjustments> CoolingBuffer::parse_layer_gcode(const std::string &gcode, std::vector<float> ¤t_pos) const +{ + const FullPrintConfig &config = m_gcodegen.config(); + const std::vector<Extruder> &extruders = m_gcodegen.writer().extruders(); + unsigned int num_extruders = 0; + for (const Extruder &ex : extruders) + num_extruders = std::max(ex.id() + 1, num_extruders); + + std::vector<PerExtruderAdjustments> per_extruder_adjustments(extruders.size()); + std::vector<size_t> map_extruder_to_per_extruder_adjustment(num_extruders, 0); + for (size_t i = 0; i < extruders.size(); ++ i) { + PerExtruderAdjustments &adj = per_extruder_adjustments[i]; + unsigned int extruder_id = extruders[i].id(); + adj.extruder_id = extruder_id; + adj.cooling_slow_down_enabled = config.cooling.get_at(extruder_id); + adj.slowdown_below_layer_time = config.slowdown_below_layer_time.get_at(extruder_id); + adj.min_print_speed = config.min_print_speed.get_at(extruder_id); + map_extruder_to_per_extruder_adjustment[extruder_id] = i; + } + + const std::string toolchange_prefix = m_gcodegen.writer().toolchange_prefix(); + unsigned int current_extruder = m_current_extruder; + PerExtruderAdjustments *adjustment = &per_extruder_adjustments[map_extruder_to_per_extruder_adjustment[current_extruder]]; + const char *line_start = gcode.c_str(); + const char *line_end = line_start; + const char extrusion_axis = config.get_extrusion_axis()[0]; + // Index of an existing CoolingLine of the current adjustment, which holds the feedrate setting command + // for a sequence of extrusion moves. + size_t active_speed_modifier = size_t(-1); + + for (; *line_start != 0; line_start = line_end) + { + while (*line_end != '\n' && *line_end != 0) + ++ line_end; + // sline will not contain the trailing '\n'. + std::string sline(line_start, line_end); + // CoolingLine will contain the trailing '\n'. + if (*line_end == '\n') + ++ line_end; + CoolingLine line(0, line_start - gcode.c_str(), line_end - gcode.c_str()); + if (boost::starts_with(sline, "G0 ")) + line.type = CoolingLine::TYPE_G0; + else if (boost::starts_with(sline, "G1 ")) + line.type = CoolingLine::TYPE_G1; + else if (boost::starts_with(sline, "G92 ")) + line.type = CoolingLine::TYPE_G92; + if (line.type) { + // G0, G1 or G92 + // Parse the G-code line. + std::vector<float> new_pos(current_pos); + const char *c = sline.data() + 3; + for (;;) { + // Skip whitespaces. + for (; *c == ' ' || *c == '\t'; ++ c); + if (*c == 0 || *c == ';') + break; + // Parse the axis. + size_t axis = (*c >= 'X' && *c <= 'Z') ? (*c - 'X') : + (*c == extrusion_axis) ? 3 : (*c == 'F') ? 4 : size_t(-1); + if (axis != size_t(-1)) { + new_pos[axis] = float(atof(++c)); + if (axis == 4) { + // Convert mm/min to mm/sec. + new_pos[4] /= 60.f; + if ((line.type & CoolingLine::TYPE_G92) == 0) + // This is G0 or G1 line and it sets the feedrate. This mark is used for reducing the duplicate F calls. + line.type |= CoolingLine::TYPE_HAS_F; + } + } + // Skip this word. + for (; *c != ' ' && *c != '\t' && *c != 0; ++ c); + } + bool external_perimeter = boost::contains(sline, ";_EXTERNAL_PERIMETER"); + bool wipe = boost::contains(sline, ";_WIPE"); + if (external_perimeter) + line.type |= CoolingLine::TYPE_EXTERNAL_PERIMETER; + if (wipe) + line.type |= CoolingLine::TYPE_WIPE; + if (boost::contains(sline, ";_EXTRUDE_SET_SPEED") && ! wipe) { + line.type |= CoolingLine::TYPE_ADJUSTABLE; + active_speed_modifier = adjustment->lines.size(); + } + if ((line.type & CoolingLine::TYPE_G92) == 0) { + // G0 or G1. Calculate the duration. + if (config.use_relative_e_distances.value) + // Reset extruder accumulator. + current_pos[3] = 0.f; + float dif[4]; + for (size_t i = 0; i < 4; ++ i) + dif[i] = new_pos[i] - current_pos[i]; + float dxy2 = dif[0] * dif[0] + dif[1] * dif[1]; + float dxyz2 = dxy2 + dif[2] * dif[2]; + if (dxyz2 > 0.f) { + // Movement in xyz, calculate time from the xyz Euclidian distance. + line.length = sqrt(dxyz2); + } else if (std::abs(dif[3]) > 0.f) { + // Movement in the extruder axis. + line.length = std::abs(dif[3]); + } + line.feedrate = new_pos[4]; + assert((line.type & CoolingLine::TYPE_ADJUSTABLE) == 0 || line.feedrate > 0.f); + if (line.length > 0) + line.time = line.length / line.feedrate; + line.time_max = line.time; + if ((line.type & CoolingLine::TYPE_ADJUSTABLE) || active_speed_modifier != size_t(-1)) + line.time_max = (adjustment->min_print_speed == 0.f) ? FLT_MAX : std::max(line.time, line.length / adjustment->min_print_speed); + if (active_speed_modifier < adjustment->lines.size() && (line.type & CoolingLine::TYPE_G1)) { + // Inside the ";_EXTRUDE_SET_SPEED" blocks, there must not be a G1 Fxx entry. + assert((line.type & CoolingLine::TYPE_HAS_F) == 0); + CoolingLine &sm = adjustment->lines[active_speed_modifier]; + assert(sm.feedrate > 0.f); + sm.length += line.length; + sm.time += line.time; + if (sm.time_max != FLT_MAX) { + if (line.time_max == FLT_MAX) + sm.time_max = FLT_MAX; + else + sm.time_max += line.time_max; + } + // Don't store this line. + line.type = 0; + } + } + current_pos = std::move(new_pos); + } else if (boost::starts_with(sline, ";_EXTRUDE_END")) { + line.type = CoolingLine::TYPE_EXTRUDE_END; + active_speed_modifier = size_t(-1); + } else if (boost::starts_with(sline, toolchange_prefix)) { + // Switch the tool. + line.type = CoolingLine::TYPE_SET_TOOL; + unsigned int new_extruder = (unsigned int)atoi(sline.c_str() + toolchange_prefix.size()); + if (new_extruder != current_extruder) { + current_extruder = new_extruder; + adjustment = &per_extruder_adjustments[map_extruder_to_per_extruder_adjustment[current_extruder]]; + } + } else if (boost::starts_with(sline, ";_BRIDGE_FAN_START")) { + line.type = CoolingLine::TYPE_BRIDGE_FAN_START; + } else if (boost::starts_with(sline, ";_BRIDGE_FAN_END")) { + line.type = CoolingLine::TYPE_BRIDGE_FAN_END; + } else if (boost::starts_with(sline, "G4 ")) { + // Parse the wait time. + line.type = CoolingLine::TYPE_G4; + size_t pos_S = sline.find('S', 3); + size_t pos_P = sline.find('P', 3); + line.time = line.time_max = float( + (pos_S > 0) ? atof(sline.c_str() + pos_S + 1) : + (pos_P > 0) ? atof(sline.c_str() + pos_P + 1) * 0.001 : 0.); + } + if (line.type != 0) + adjustment->lines.emplace_back(std::move(line)); + } + + return per_extruder_adjustments; +} + +// Slow down an extruder range proportionally down to slowdown_below_layer_time. +// Return the total time for the complete layer. +static inline float extruder_range_slow_down_proportional( + std::vector<PerExtruderAdjustments*>::iterator it_begin, + std::vector<PerExtruderAdjustments*>::iterator it_end, + // Elapsed time for the extruders already processed. + float elapsed_time_total0, + // Initial total elapsed time before slow down. + float elapsed_time_before_slowdown, + // Target time for the complete layer (all extruders applied). + float slowdown_below_layer_time) +{ + // Total layer time after the slow down has been applied. + float total_after_slowdown = elapsed_time_before_slowdown; + // Now decide, whether the external perimeters shall be slowed down as well. + float max_time_nep = elapsed_time_total0; + for (auto it = it_begin; it != it_end; ++ it) + max_time_nep += (*it)->maximum_time_after_slowdown(false); + if (max_time_nep > slowdown_below_layer_time) { + // It is sufficient to slow down the non-external perimeter moves to reach the target layer time. + // Slow down the non-external perimeters proportionally. + float non_adjustable_time = elapsed_time_total0; + for (auto it = it_begin; it != it_end; ++ it) + non_adjustable_time += (*it)->non_adjustable_time(false); + // The following step is a linear programming task due to the minimum movement speeds of the print moves. + // Run maximum 5 iterations until a good enough approximation is reached. + for (size_t iter = 0; iter < 5; ++ iter) { + float factor = (slowdown_below_layer_time - non_adjustable_time) / (total_after_slowdown - non_adjustable_time); + assert(factor > 1.f); + total_after_slowdown = elapsed_time_total0; + for (auto it = it_begin; it != it_end; ++ it) + total_after_slowdown += (*it)->slow_down_proportional(factor, false); + if (total_after_slowdown > 0.95f * slowdown_below_layer_time) + break; + } + } else { + // Slow down everything. First slow down the non-external perimeters to maximum. + for (auto it = it_begin; it != it_end; ++ it) + (*it)->slowdown_to_minimum_feedrate(false); + // Slow down the external perimeters proportionally. + float non_adjustable_time = elapsed_time_total0; + for (auto it = it_begin; it != it_end; ++ it) + non_adjustable_time += (*it)->non_adjustable_time(true); + for (size_t iter = 0; iter < 5; ++ iter) { + float factor = (slowdown_below_layer_time - non_adjustable_time) / (total_after_slowdown - non_adjustable_time); + assert(factor > 1.f); + total_after_slowdown = elapsed_time_total0; + for (auto it = it_begin; it != it_end; ++ it) + total_after_slowdown += (*it)->slow_down_proportional(factor, true); + if (total_after_slowdown > 0.95f * slowdown_below_layer_time) + break; + } + } + return total_after_slowdown; +} + +// Slow down an extruder range to slowdown_below_layer_time. +// Return the total time for the complete layer. +static inline void extruder_range_slow_down_non_proportional( + std::vector<PerExtruderAdjustments*>::iterator it_begin, + std::vector<PerExtruderAdjustments*>::iterator it_end, + float time_stretch) +{ + // Slow down. Try to equalize the feedrates. + std::vector<PerExtruderAdjustments*> by_min_print_speed(it_begin, it_end); + // Find the next highest adjustable feedrate among the extruders. + float feedrate = 0; + for (PerExtruderAdjustments *adj : by_min_print_speed) { + adj->idx_line_begin = 0; + adj->idx_line_end = 0; + assert(adj->idx_line_begin < adj->n_lines_adjustable); + if (adj->lines[adj->idx_line_begin].feedrate > feedrate) + feedrate = adj->lines[adj->idx_line_begin].feedrate; + } + assert(feedrate > 0.f); + // Sort by min_print_speed, maximum speed first. + std::sort(by_min_print_speed.begin(), by_min_print_speed.end(), + [](const PerExtruderAdjustments *p1, const PerExtruderAdjustments *p2){ return p1->min_print_speed > p2->min_print_speed; }); + // Slow down, fast moves first. + for (;;) { + // For each extruder, find the span of lines with a feedrate close to feedrate. + for (PerExtruderAdjustments *adj : by_min_print_speed) { + for (adj->idx_line_end = adj->idx_line_begin; + adj->idx_line_end < adj->n_lines_adjustable && adj->lines[adj->idx_line_end].feedrate > feedrate - EPSILON; + ++ adj->idx_line_end) ; + } + // Find the next highest adjustable feedrate among the extruders. + float feedrate_next = 0.f; + for (PerExtruderAdjustments *adj : by_min_print_speed) + if (adj->idx_line_end < adj->n_lines_adjustable && adj->lines[adj->idx_line_end].feedrate > feedrate_next) + feedrate_next = adj->lines[adj->idx_line_end].feedrate; + // Slow down, limited by max(feedrate_next, min_print_speed). + for (auto adj = by_min_print_speed.begin(); adj != by_min_print_speed.end();) { + // Slow down at most by time_stretch. + if ((*adj)->min_print_speed == 0.f) { + // All the adjustable speeds are now lowered to the same speed, + // and the minimum speed is set to zero. + float time_adjustable = 0.f; + for (auto it = adj; it != by_min_print_speed.end(); ++ it) + time_adjustable += (*it)->adjustable_time(true); + float rate = (time_adjustable + time_stretch) / time_adjustable; + for (auto it = adj; it != by_min_print_speed.end(); ++ it) + (*it)->slow_down_proportional(rate, true); + return; + } else { + float feedrate_limit = std::max(feedrate_next, (*adj)->min_print_speed); + bool done = false; + float time_stretch_max = 0.f; + for (auto it = adj; it != by_min_print_speed.end(); ++ it) + time_stretch_max += (*it)->time_stretch_when_slowing_down_to_feedrate(feedrate_limit); + if (time_stretch_max >= time_stretch) { + feedrate_limit = feedrate - (feedrate - feedrate_limit) * time_stretch / time_stretch_max; + done = true; + } else + time_stretch -= time_stretch_max; + for (auto it = adj; it != by_min_print_speed.end(); ++ it) + (*it)->slow_down_to_feedrate(feedrate_limit); + if (done) + return; + } + // Skip the other extruders with nearly the same min_print_speed, as they have been processed already. + auto next = adj; + for (++ next; next != by_min_print_speed.end() && (*next)->min_print_speed > (*adj)->min_print_speed - EPSILON; ++ next); + adj = next; + } + if (feedrate_next == 0.f) + // There are no other extrusions available for slow down. + break; + for (PerExtruderAdjustments *adj : by_min_print_speed) { + adj->idx_line_begin = adj->idx_line_end; + feedrate = feedrate_next; + } + } +} + +// Calculate slow down for all the extruders. +float CoolingBuffer::calculate_layer_slowdown(std::vector<PerExtruderAdjustments> &per_extruder_adjustments) +{ + // Sort the extruders by an increasing slowdown_below_layer_time. + // The layers with a lower slowdown_below_layer_time are slowed down + // together with all the other layers with slowdown_below_layer_time above. + std::vector<PerExtruderAdjustments*> by_slowdown_time; + by_slowdown_time.reserve(per_extruder_adjustments.size()); + // Only insert entries, which are adjustable (have cooling enabled and non-zero stretchable time). + // Collect total print time of non-adjustable extruders. + float elapsed_time_total0 = 0.f; + for (PerExtruderAdjustments &adj : per_extruder_adjustments) { + // Curren total time for this extruder. + adj.time_total = adj.elapsed_time_total(); + // Maximum time for this extruder, when all extrusion moves are slowed down to min_extrusion_speed. + adj.time_maximum = adj.maximum_time_after_slowdown(true); + if (adj.cooling_slow_down_enabled && adj.lines.size() > 0) { + by_slowdown_time.emplace_back(&adj); + if (! m_cooling_logic_proportional) + // sorts the lines, also sets adj.time_non_adjustable + adj.sort_lines_by_decreasing_feedrate(); + } else + elapsed_time_total0 += adj.elapsed_time_total(); + } + std::sort(by_slowdown_time.begin(), by_slowdown_time.end(), + [](const PerExtruderAdjustments *adj1, const PerExtruderAdjustments *adj2) + { return adj1->slowdown_below_layer_time < adj2->slowdown_below_layer_time; }); + + for (auto cur_begin = by_slowdown_time.begin(); cur_begin != by_slowdown_time.end(); ++ cur_begin) { + PerExtruderAdjustments &adj = *(*cur_begin); + // Calculate the current adjusted elapsed_time_total over the non-finalized extruders. + float total = elapsed_time_total0; + for (auto it = cur_begin; it != by_slowdown_time.end(); ++ it) + total += (*it)->time_total; + float slowdown_below_layer_time = adj.slowdown_below_layer_time * 1.001f; + if (total > slowdown_below_layer_time) { + // The current total time is above the minimum threshold of the rest of the extruders, don't adjust anything. + } else { + // Adjust this and all the following (higher config.slowdown_below_layer_time) extruders. + // Sum maximum slow down time as if everything was slowed down including the external perimeters. + float max_time = elapsed_time_total0; + for (auto it = cur_begin; it != by_slowdown_time.end(); ++ it) + max_time += (*it)->time_maximum; + if (max_time > slowdown_below_layer_time) { + if (m_cooling_logic_proportional) + extruder_range_slow_down_proportional(cur_begin, by_slowdown_time.end(), elapsed_time_total0, total, slowdown_below_layer_time); + else + extruder_range_slow_down_non_proportional(cur_begin, by_slowdown_time.end(), slowdown_below_layer_time - total); + } else { + // Slow down to maximum possible. + for (auto it = cur_begin; it != by_slowdown_time.end(); ++ it) + (*it)->slowdown_to_minimum_feedrate(true); + } + } + elapsed_time_total0 += adj.elapsed_time_total(); + } + + return elapsed_time_total0; +} + +// Apply slow down over G-code lines stored in per_extruder_adjustments, enable fan if needed. +// Returns the adjusted G-code. +std::string CoolingBuffer::apply_layer_cooldown( + // Source G-code for the current layer. + const std::string &gcode, + // ID of the current layer, used to disable fan for the first n layers. + size_t layer_id, + // Total time of this layer after slow down, used to control the fan. + float layer_time, + // Per extruder list of G-code lines and their cool down attributes. + std::vector<PerExtruderAdjustments> &per_extruder_adjustments) +{ + // First sort the adjustment lines by of multiple extruders by their position in the source G-code. + std::vector<const CoolingLine*> lines; + { + size_t n_lines = 0; + for (const PerExtruderAdjustments &adj : per_extruder_adjustments) + n_lines += adj.lines.size(); + lines.reserve(n_lines); + for (const PerExtruderAdjustments &adj : per_extruder_adjustments) + for (const CoolingLine &line : adj.lines) + lines.emplace_back(&line); + std::sort(lines.begin(), lines.end(), [](const CoolingLine *ln1, const CoolingLine *ln2) { return ln1->line_start < ln2->line_start; } ); + } + // Second generate the adjusted G-code. + std::string new_gcode; + new_gcode.reserve(gcode.size() * 2); + int fan_speed = -1; + bool bridge_fan_control = false; + int bridge_fan_speed = 0; + auto change_extruder_set_fan = [ this, layer_id, layer_time, &new_gcode, &fan_speed, &bridge_fan_control, &bridge_fan_speed ]() { + const FullPrintConfig &config = m_gcodegen.config(); +#define EXTRUDER_CONFIG(OPT) config.OPT.get_at(m_current_extruder) + int min_fan_speed = EXTRUDER_CONFIG(min_fan_speed); + int fan_speed_new = EXTRUDER_CONFIG(fan_always_on) ? min_fan_speed : 0; + if (layer_id >= EXTRUDER_CONFIG(disable_fan_first_layers)) { + int max_fan_speed = EXTRUDER_CONFIG(max_fan_speed); + float slowdown_below_layer_time = float(EXTRUDER_CONFIG(slowdown_below_layer_time)); + float fan_below_layer_time = float(EXTRUDER_CONFIG(fan_below_layer_time)); + if (EXTRUDER_CONFIG(cooling)) { + if (layer_time < slowdown_below_layer_time) { + // Layer time very short. Enable the fan to a full throttle. + fan_speed_new = max_fan_speed; + } else if (layer_time < fan_below_layer_time) { + // Layer time quite short. Enable the fan proportionally according to the current layer time. + assert(layer_time >= slowdown_below_layer_time); + double t = (layer_time - slowdown_below_layer_time) / (fan_below_layer_time - slowdown_below_layer_time); + fan_speed_new = int(floor(t * min_fan_speed + (1. - t) * max_fan_speed) + 0.5); + } + } + bridge_fan_speed = EXTRUDER_CONFIG(bridge_fan_speed); +#undef EXTRUDER_CONFIG + bridge_fan_control = bridge_fan_speed > fan_speed_new; + } else { + bridge_fan_control = false; + bridge_fan_speed = 0; + fan_speed_new = 0; + } + if (fan_speed_new != fan_speed) { + fan_speed = fan_speed_new; + new_gcode += m_gcodegen.writer().set_fan(fan_speed); + } + }; + + const char *pos = gcode.c_str(); + int current_feedrate = 0; + const std::string toolchange_prefix = m_gcodegen.writer().toolchange_prefix(); + change_extruder_set_fan(); + for (const CoolingLine *line : lines) { + const char *line_start = gcode.c_str() + line->line_start; + const char *line_end = gcode.c_str() + line->line_end; + if (line_start > pos) + new_gcode.append(pos, line_start - pos); + if (line->type & CoolingLine::TYPE_SET_TOOL) { + unsigned int new_extruder = (unsigned int)atoi(line_start + toolchange_prefix.size()); + if (new_extruder != m_current_extruder) { + m_current_extruder = new_extruder; + change_extruder_set_fan(); + } + new_gcode.append(line_start, line_end - line_start); + } else if (line->type & CoolingLine::TYPE_BRIDGE_FAN_START) { + if (bridge_fan_control) + new_gcode += m_gcodegen.writer().set_fan(bridge_fan_speed, true); + } else if (line->type & CoolingLine::TYPE_BRIDGE_FAN_END) { + if (bridge_fan_control) + new_gcode += m_gcodegen.writer().set_fan(fan_speed, true); + } else if (line->type & CoolingLine::TYPE_EXTRUDE_END) { + // Just remove this comment. + } else if (line->type & (CoolingLine::TYPE_ADJUSTABLE | CoolingLine::TYPE_EXTERNAL_PERIMETER | CoolingLine::TYPE_WIPE | CoolingLine::TYPE_HAS_F)) { + // Find the start of a comment, or roll to the end of line. + const char *end = line_start; + for (; end < line_end && *end != ';'; ++ end); + // Find the 'F' word. + const char *fpos = strstr(line_start + 2, " F") + 2; + int new_feedrate = current_feedrate; + bool modify = false; + assert(fpos != nullptr); + if (line->slowdown) { + modify = true; + new_feedrate = int(floor(60. * line->feedrate + 0.5)); + } else { + new_feedrate = atoi(fpos); + if (new_feedrate != current_feedrate) { + // Append the line without the comment. + new_gcode.append(line_start, end - line_start); + current_feedrate = new_feedrate; + } else if ((line->type & (CoolingLine::TYPE_ADJUSTABLE | CoolingLine::TYPE_EXTERNAL_PERIMETER | CoolingLine::TYPE_WIPE)) || line->length == 0.) { + // Feedrate does not change and this line does not move the print head. Skip the complete G-code line including the G-code comment. + end = line_end; + } else { + // Remove the feedrate from the G0/G1 line. + modify = true; + } + } + if (modify) { + if (new_feedrate != current_feedrate) { + // Replace the feedrate. + new_gcode.append(line_start, fpos - line_start); + current_feedrate = new_feedrate; + char buf[64]; + sprintf(buf, "%d", int(current_feedrate)); + new_gcode += buf; + } else { + // Remove the feedrate word. + const char *f = fpos; + // Roll the pointer before the 'F' word. + for (f -= 2; f > line_start && (*f == ' ' || *f == '\t'); -- f); + // Append up to the F word, without the trailing whitespace. + new_gcode.append(line_start, f - line_start + 1); + } + // Skip the non-whitespaces of the F parameter up the comment or end of line. + for (; fpos != end && *fpos != ' ' && *fpos != ';' && *fpos != '\n'; ++fpos); + // Append the rest of the line without the comment. + if (fpos < end) + new_gcode.append(fpos, end - fpos); + // There should never be an empty G1 statement emited by the filter. Such lines should be removed completely. + assert(new_gcode.size() < 4 || new_gcode.substr(new_gcode.size() - 4) != "G1 \n"); + } + // Process the rest of the line. + if (end < line_end) { + if (line->type & (CoolingLine::TYPE_ADJUSTABLE | CoolingLine::TYPE_EXTERNAL_PERIMETER | CoolingLine::TYPE_WIPE)) { + // Process comments, remove ";_EXTRUDE_SET_SPEED", ";_EXTERNAL_PERIMETER", ";_WIPE" + std::string comment(end, line_end); + boost::replace_all(comment, ";_EXTRUDE_SET_SPEED", ""); + if (line->type & CoolingLine::TYPE_EXTERNAL_PERIMETER) + boost::replace_all(comment, ";_EXTERNAL_PERIMETER", ""); + if (line->type & CoolingLine::TYPE_WIPE) + boost::replace_all(comment, ";_WIPE", ""); + new_gcode += comment; + } else { + // Just attach the rest of the source line. + new_gcode.append(end, line_end - end); + } + } + } else { + new_gcode.append(line_start, line_end - line_start); + } + pos = line_end; + } + const char *gcode_end = gcode.c_str() + gcode.size(); + if (pos < gcode_end) + new_gcode.append(pos, gcode_end - pos); + + return new_gcode; +} + +} // namespace Slic3r |