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// Flying extruder suspender.
// This works with Shane's extruder (which works quite well) and many others.
//
// Requires:
// Qty: Description
// 2: M3x16 SHCS for pinching motor.
// 2: M3 nuts for pinching motor.
// 1: M3x10 SHCS for suspending motor.
// 1: M3 nylock nut for suspending motor.
// 3: 190mm long pieces of 1/4" (6mm) inside diameter 3/8" (9mm) outside
// diameter rubber tubing for suspending from carriages. If you're using
// this on a different sized printer, then the rubber tubing should be a
// little bit more than half the length of the horizontal extrusions.
// 3: M3 nylock nuts for attaching to the M3x35 SHCS on the carriages.
// 6: small zip ties for securing rubber tubing.
// 1: Key-Bak "Super48" heavy duty retractable key holder, 48" Kevlar cord,
// 8-10 oz retraction force (which seems to be plenty). Here is the Amazon
// link: https://www.amazon.com/KEY-BAK-Retractable-Stainless-Polycarbonate-Oversized/dp/B0088MQ9JS
// 4: small zip ties, two to attach the Key-Bak to the frame, one to act as a
// as a filament guide near the top, and one to attach the Key-Bak to
// motorWyeSuspender (with a little bit of string).
//
//
// This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
// International License.
// Visit: http://creativecommons.org/licenses/by-sa/4.0/
//
// Haydn Huntley
// haydn.huntley@gmail.com
$fn = 360/8;
include <configuration.scad>;
include <roundedBox.scad>;
include <motor.scad>;
zMotorRing = 10.0;
motorRingThickness = 3.0;
rubberTubingID = 0.25*mmPerInch + 5*smidge;
module motorRing()
{
xyScale = (nema17Width+2*motorRingThickness) / nema17Width;
motorWingSize = 10.7-m3NutRadius+1;
motorWingThickness = 4*motorRingThickness;
difference()
{
union()
{
// The basic shape of the ring, motorRingThickness thick.
scale([xyScale, xyScale, 1])
motorRingHelper();
// Add the wings for the M3 bolts to secure it.
hull()
{
translate([0, 0, zMotorRing/2])
rotate([90, 0, 0])
roundedBox([nema17Width*xyScale+2*motorWingSize,
zMotorRing,
motorWingThickness], zMotorRing/2, true);
scale([xyScale, xyScale, 1])
motorRingHelper();
}
// Add extra material to thicken the top where the
// M3 bolt to suspend it will be.
translate([0, nema17Width*xyScale/2, zMotorRing/2])
rotate([-90, 0, 0])
cylinder(d1=zMotorRing,
d2=2*m3LooseRadius,
h=motorRingThickness,
$fn=24);
}
// Remove a hole in the middle for the NEMA17 motor.
translate([0, 0, -smidge/2])
scale([1, 1, 1.01])
motorRingHelper();
// Cut it into two pieces.
translate([0, 0, zMotorRing/2])
cube([nema17Width*xyScale+2*motorWingSize+smidge,
motorRingThickness,
zMotorRing+smidge], true);
// Holes for two M3x16 bolts with nuts to tighten it.
for (x = [1, -1])
translate([x*(nema17Width*xyScale+motorWingSize-1)/2,
0,
zMotorRing/2])
rotate([90, 0, 0])
{
// M3 SHCS head.
translate([0, 0, -6])
rotate([0, 0, 30])
rotate([0, 180, 0])
cylinder(r1=m3LooseHeadRadius,
r2=m3LooseHeadRadius+4*smidge,
h=motorWingThickness*0.75,
center=false,
$fn=24);
// M3 shaft.
cylinder(r=m3LooseRadius,
h=2*motorWingThickness,
center=true,
$fn=24);
// Make room for an M3 nut trap.
translate([0, 0, 6])
rotate([0, 0, 30])
cylinder(r1=m3TightNutRadius,
r2=m3LooseNutRadius+4*smidge,
h=motorWingThickness*0.75,
center=false,
$fn=6);
}
// A hole for an M3x10 bolt and nut to suspend it from.
translate([0, nema17Width/2, zMotorRing/2])
rotate([-90, 0, 0])
translate([0, 0, -smidge/2])
{
cylinder(r=m3LooseRadius, h=2*motorRingThickness+smidge, $fn=24);
cylinder(r=m3LooseHeadRadius, h=m3HeadHeight+2*smidge, $fn=24);
}
}
}
module motorWyeSuspender()
{
difference()
{
union()
{
// The common body of the "wye".
cylinder(d=zMotorRing, h=rubberTubingID);
// The three arms to attach it to the 0.25" ID rubber tubing.
for (a = [1:3])
rotate([0, 0, a*120])
translate([0, 0, rubberTubingID/2])
rotate([-90, 0, 0])
cylinder(d=rubberTubingID, h=15);
}
// Hole for the M3 bolt to attach it to the motorRing.
translate([0, 0, -smidge/2])
cylinder(r=m3LooseRadius, h=rubberTubingID+smidge, $fn=24);
// Pocket for the M3 nut to secure it to the motor.
translate([0, 0, rubberTubingID-m3NutHeight])
cylinder(r1=m3TightNutRadius,
r2=m3LooseNutRadius,
h=m3NutHeight+smidge, $fn=6);
}
}
module motorRingHelper()
{
intersection()
{
rotate([0, -90, 0])
nema17Motor();
translate([0, 0, zMotorRing/2])
cube([nema17Width, nema17Width, zMotorRing], true);
}
}
module tubingAdapter()
{
h = 14.0 - m3NylockNutHeight;
difference()
{
cylinder(d=rubberTubingID, h=h);
translate([0, 0, -smidge/2])
cylinder(r=m3LooseRadius, h=h+smidge);
}
}
motorRing();
// Flip the wye upside down for printing.
motorWyeSuspender();
// Include 3 adaptors for mating the M3x35 SHCS on the carriages to the
// 0.25" ID rubber tubing.
for (a = [0:2])
rotate([0, 0, a*120])
translate([0, -15, 0])
tubingAdapter();
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