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extruder_idler_parts.scad
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extruder_idler_parts.scad
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include <config.scad>
use <GDMUtils.scad>
use <NEMA.scad>
use <acme_screw.scad>
use <joiners.scad>
$fa = 2;
$fs = 1;
width = extruder_shaft_len/2;
thick = 3.5;
topthick = 5;
motor_width = nema_motor_width(17);
frontside = 0*(jhead_barrel_diam+8)/2+4;
backside = (jhead_barrel_diam+8)/2+8;
topside = motor_width*0.25+topthick;
botside = motor_width/2+jhead_shelf_thick-thick;
module extruder_idler()
{
color("Tan")
prerender(convexity=10)
difference() {
union() {
// Top bar
up(topside-topthick/2) {
back((frontside+backside)/2-frontside) {
cube([width, frontside+backside, topthick], center=true);
}
}
// Vertical bar
back(backside-thick/2) {
up((topside+botside+5)/2-botside) {
cube([width, thick, topside+botside+5], center=true);
}
}
// bearing supports
back((backside-extruder_idler_diam/2+extruder_idler_axle/3)/2+(extruder_idler_diam/2-extruder_idler_axle/3)) {
up(topside/4) {
difference() {
cube([width, backside-extruder_idler_diam/2+extruder_idler_axle/3+0.05, extruder_idler_diam*2/3/2+topside], center=true);
down((extruder_idler_diam*2/3/2+topside)/2) {
fwd((backside-extruder_idler_diam/2+extruder_idler_axle/3)/2) {
xrot(45) cube([width+0.05, extruder_idler_diam/6, extruder_idler_diam/6], center=true);
}
}
}
}
}
// Bottom clip
down(botside) {
back(backside-thick) {
difference() {
xrot(-45) {
union() {
yrot(90) cylinder(r=thick, h=width, center=true, $fs=1);
up(thick) cube([width, thick*2, thick*2], center=true);
}
}
back(3*thick) cube([width+1, 4*thick, 4*thick], center=true);
}
}
}
}
// Filament hole
cylinder(d=filament_diam*2, h=100, $fn=12);
// Clearance for idler bearing
back(extruder_idler_diam/2) {
yrot(90) cylinder(d=extruder_idler_axle, h=extruder_idler_width+10, center=true, $fs=1);
yrot(90) cylinder(d=extruder_idler_diam+2, h=extruder_idler_width+printer_slop, center=true, $fs=1);
difference() {
yrot(90) cylinder(d=extruder_idler_diam+2, h=extruder_idler_width+1, center=true, $fs=1);
yrot(90) cylinder(d=extruder_idler_axle+4, h=extruder_idler_width+1.1, center=true, $fs=1);
}
}
// Strengthening holes
up(topside/2-3) {
back(backside-thick/2) {
zspread(3, n=6) {
xspread(3, n=floor(width/3)-1) {
xrot(90) cylinder(d=0.5, h=thick+1, center=true, $fn=3);
}
}
}
}
}
}
//!extruder_idler();
module idler_bearing()
{
difference() {
union() {
color("silver") {
difference() {
yrot(90) cylinder(d=extruder_idler_diam, h=extruder_idler_width, center=true);
yrot(90) cylinder(d=extruder_idler_diam-2, h=extruder_idler_width+1, center=true);
}
}
color("darkgray") {
yrot(90) cylinder(d=extruder_idler_diam-0.5, h=extruder_idler_width-0.5, center=true);
}
color("silver") {
yrot(90) cylinder(d=extruder_idler_axle+2, h=extruder_idler_width, center=true);
}
}
color("silver") {
yrot(90) cylinder(d=extruder_idler_axle, h=extruder_idler_width+10, center=true);
}
}
}
//!idler_bearing();
module extruder_idler_axle() {
color("Tan") {
cylinder(h=1, d=extruder_idler_axle+2);
up(1-0.05) {
difference() {
cylinder(h=width+printer_slop*2+2.5, d=extruder_idler_axle);
up(width+printer_slop*2) {
extruder_idler_axle_clip();
}
}
}
}
}
//!extruder_idler_axle();
module extruder_idler_axle_clip() {
color("Tan") {
difference() {
cylinder(h=2, d=extruder_idler_axle+4);
down(0.05) {
cylinder(h=2.1, d1=extruder_idler_axle-2, d2=extruder_idler_axle);
hull() {
cylinder(h=2.1, d1=extruder_idler_axle-3, d2=extruder_idler_axle-0.5);
left(5) cylinder(h=2.1, d1=extruder_idler_axle-3, d2=extruder_idler_axle-0.5);
}
left(extruder_idler_axle*1.5) cube(size=2*extruder_idler_axle, center=true);
}
}
}
}
//!extruder_idler_axle_clip();
module extruder_idler_parts() { // make me
up(backside) xrot(-90) extruder_idler();
right(15) {
fwd(10) extruder_idler_axle();
back(10) extruder_idler_axle_clip();
}
}
extruder_idler_parts();
// vim: noexpandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap