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screw_tolerance=0.1; slide_tolerance=.3; play_tolerance=.8;
draft=true;
use <e3dchimera.scad>;
assembly_height = 49.5; // the height of e3d chimera assembly in e3dchimera.scad
hs_nozzles_from_back = 6; // the distance from nozzles from the back of the heatsink
hs_size = [30,18,30]; // the heatsink size
mounting_holes_from_top = [ // the offsets of mounting holes on the back
[0, 20], [-4.5,10], [4.5,10]
];
mounting_holes_on_top = [ // the offsets of mounting holes on the top
[0,-3], [-17/2,9], [17/2,9]
];
feeds_apart = 18; // the distance between nozzles (and, therefore filament feeds)
feed_shell_d = 17; // the shell diameter around filament feed, pushfit's diameter
screw_shell_d = 8; // the shell diameter around screws
thread_h = 10.5; // the height of the pushfit's thread
hinge_s = 6; // hinges thickness
screwhead_d = 5.5; // the diameter of the screw head
screwhead_h = 3; // the height of the screw head
ms_size = [19.8,6,10]; // microswitch dimensions
ms_screws_apart = 9.5; // distance between microswitch mounting screws
ms_switch_offset = 2.5; // the offset of the switch from the center
ms_bump = ms_size[1]; // how far from hinge microswitch is mounted
lower_by = 15; // lower hotend from the original intention by this long
gap = 5; // gap between microswitch and heatsink
ps_offset = 3+3; // pushscrew offset from the hinge
back_thickness = 8; // thickness of the part behind the hinge
nut_thickness = 2.5; // intelligent guess should suffice
nut_width = 5.5; // intelligent guess should suffice
link_thickness=3; // thickness of link holder protrusion
link_or=3.5; // link outer diameter
link_ir=1.5; // link inner diameter
use <threads.scad>;
/* the internal thread for e3d bowden coupling: http://e3d-online.com/E3D-v6/Spares/Threaded-Bowden-Coupling-1.75mm-Filament */
module pushfit_thread(h=thread_h) {
thr = 3/8 + .5/25.4;
slit = 25.4*thr/2 + 0.4;
translate([0,0,-1]) if(draft) cylinder(d=thr*25.4,h=h+2);
else english_thread(diameter=thr,threads_per_inch=28,length=(h+2)/25.4,internal=true);
translate([-2,-slit,-1]) cube([4,slit,h+2]);
}
sff = hs_nozzles_from_back+gap; // switch from feeds
hff = sff+ms_size[1]+ms_bump+thread_h/2; // hinges from feeds
module holder() {
translate([0,0,0]) difference() {
union() {
hull() {
rs = 3; drs = screw_shell_d/2-rs;
rf = 6; drf = feed_shell_d/2-rf;
for(sx=[-1,1]) translate([sx*feeds_apart/2,0,0]) {
translate([0,0,drf])
cylinder(d=feed_shell_d,h=thread_h-drf,$fn=60);
cylinder(r=rf,h=thread_h,$fn=30);
}
for(mhot = mounting_holes_on_top) translate([mhot[0],mhot[1],0]) {
translate([0,0,drs])
cylinder(d=screw_shell_d,h=thread_h-drs,$fn=30);
cylinder(r=rs,h=thread_h,$fn=30);
}
}
difference() {
hx0 = max(mounting_holes_on_top[1][1],mounting_holes_on_top[2][1])+screw_shell_d/2;
hull() {
for(ls=[-1,1]) translate([0,hx0+ls*link_or,thread_h+ls*link_or])
rotate([0,90,0]) cylinder(r=link_or,h=link_thickness,center=true,$fn=30);
}
translate([0,hx0+link_or,thread_h+link_or])
rotate([0,90,0]) cylinder(r=link_ir,h=link_thickness+2,center=true,$fn=30);
} // difference
hull() {
translate([0,0,thread_h/2]) cube(size=[hs_size[0]-2*hinge_s-2*slide_tolerance,feed_shell_d,thread_h],center=true);
translate([0,-hff,thread_h/2])
rotate([0,90,0])
cylinder(d=thread_h,h=hs_size[0]-2*hinge_s-2*slide_tolerance,center=true,$fn=60);
}
}//union
for(sx=[-1,1]) translate([sx*feeds_apart/2,0,0])
pushfit_thread();
for(mhot = mounting_holes_on_top) translate([mhot[0],mhot[1],0]) {
translate([0,0,-1]) cylinder(d=3,h=thread_h+2,$fn=12); // TODO: sink heads
translate([0,0,thread_h/2]) cylinder(d=screwhead_d+slide_tolerance,h=thread_h/2+1,$fn=30);
}
// hinge
translate([0,-hff,thread_h/2])
rotate([0,90,0]) cylinder(d=3+slide_tolerance,h=hs_size[0],center=true,$fn=12);
// push screw
hull() for(oy=[-1,1]) translate([0,-hff+ps_offset+oy,-1]) cylinder(d=3+play_tolerance,h=thread_h+2,$fn=30);
// tune screw
translate([0,-sff-ms_size[1]/2,-1]) cylinder(d=3,h=thread_h+2);
}//difference
}
module base() {
us = ms_size[2]+screw_shell_d/2;
translate([0,-hff,0]) difference() {
union() {
for(sx=[-1,1]) translate([sx*(hs_size[0]-hinge_s)/2,0,0]) hull() {
translate([0,0,thread_h/2])
rotate([0,90,0]) cylinder(d=thread_h,h=hinge_s,center=true,$fn=60);
cube(size=[hinge_s,thread_h,thread_h],center=true);
translate([-hinge_s/2,0,-1]) mirror([0,1,0]) cube(size=[hinge_s,thread_h/2+back_thickness,thread_h+1]);
} // hull for
hull() {
translate([0,0,-us/2-slide_tolerance]) cube(size=[hs_size[0],thread_h+1,us],center=true);
for(sx=[-1,1]) translate([sx*(hs_size[0]/2-ms_bump),thread_h/2,-us-slide_tolerance])
cylinder(r=ms_bump,h=us+slide_tolerance,$fn=30);
}
translate([-hs_size[0]/2,-thread_h/2-slide_tolerance,-us-slide_tolerance])
mirror([0,1,0]) cube(size=[hs_size[0],back_thickness,us+slide_tolerance+thread_h]);
} // union
translate([0,0,thread_h/2])
rotate([0,90,0]) cylinder(d=3+screw_tolerance,h=hs_size[0]+2,center=true,$fn=12);
for(smx=[0,1]) mirror([smx,0,0])
translate([hs_size[0]/2+1,0,thread_h/2]) rotate([0,-90,0]) cylinder(d=screwhead_d+slide_tolerance,h=screwhead_h+1,$fn=30);
/* changed my mind; for(srx=[-1,1]) rotate([srx*15,0,0])
translate([0,0,thread_h/2-slide_tolerance])
cube(size=[hs_size[0]-2*hinge_s,thread_h*sqrt(2)+2,thread_h],center=true); */
// switch mount
for(sx=[-1,1]) translate([sx*ms_screws_apart/2+ms_switch_offset,thread_h/2,-ms_size[2]])
rotate([90,0,0])
cylinder(d=2.5,h=ms_size[1]*2,center=true,$fn=12);
// thing mount
translate([0,-thread_h/2-back_thickness,lower_by])
for(mhft = mounting_holes_from_top) translate([mhft[0],0,-mhft[1]]) {
rotate([-90,0,0])
translate([0,0,-1])
cylinder(d=3,h=back_thickness+1);
translate([0,back_thickness/2,0])
cube(size=[2*hs_size[0],nut_thickness+slide_tolerance,nut_width+slide_tolerance],center=true);
} // translate for
mirror([0,0,1]) translate([0,ps_offset,-1]) cylinder(d=3,h=hs_size[2]+1);
mirror([0,0,1]) translate([0,-thread_h/2+3/2,-1]) cylinder(d=3,h=us+2);
} // difference
}
view="*";
if(view=="holder") {
holder();
}else if(view=="base") {
base();
}else {
% translate([0,0,-assembly_height]) chimera_assembly();
color("lightgreen",0.7) holder();
color("darkgreen",0.7) base();
}
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