| -rw-r--r-- | another.scad | 19 |
1 files changed, 4 insertions, 15 deletions
diff --git a/another.scad b/another.scad index 9ff7f6a..e6d9ca3 100644 --- a/another.scad +++ b/another.scad @@ -51,49 +51,48 @@ module the_extruder( // empty spaces idler_travel = 3, // how far should idler travel when pressed idler_clearance=1, pulley_d_clearance=2, pulley_small_d_clearance=0.5, lever_v_clearance=.7, // vertical clearance for the lever spring_d_clearance=1, protrusion_tolerance_h=.5, // horizontal tolerance for the motor protrusion protrusion_tolerance_v=.5, // vertical tolerance for the motor protrusion mount_screw_d_tolerance=.4, idler_v_tolerance=.5, knob_bore_d_tolerance=.6, st_nut_h_tolerance=.2, st_nut_d_tolerance=.2,/* TODO: make it st_nut_w_tolerance */ st_screw_d_tolerance=.5, st_split_w_tolerance = .3, min_z_shell = 4*layer_height, // the very minimal shell thickness along z-axis. min_xy_shell = 2*extrusion_width, what="lever", // lever|body|knob|springpad|* left=false, vitamins = true, bridges = true, - tensioner = true, debug = false ) { fnd = 2*PI; fnr = 2*fnd; idler_filament_offset = filament_path_d/2; // -filament_offset; lever_shell = mount_screwhead_h+0.5; lever_thickness=max(spring_d+spring_d_clearance+layer_height*8,idler_h+idler_v_tolerance+2*lever_shell); lsd = idler_d-idler_clearance*2; // the diameter of lever thingie longwing=(mount_d+mount_screw_d+mount_screw_d_tolerance+spring_d+spring_d_clearance)/2+min_xy_shell; shortwing = let(a=mount_d/2,c=(pulley_d+idler_d)/2/sqrt(2)) sqrt(c*c+pow(a-c,2)); longwing_travel = idler_travel*longwing/shortwing; h_ = (pulley_d+idler_d)/(2*sqrt(2)); ri = sqrt( pow(h_,2) + pow(mount_d/2-h_,2) ); spring_dl = idler_travel*longwing/ri; // finger and spring support fsw = gearbox_d-(gearbox_d-mount_d)/2-max(spring_lc,longwing_travel+(gearbox_d-mount_d)/2); mount_min_depth = mounthole_min_depth ? mounthole_min_depth : mounthole_depth-1; mount_max_depth = mounthole_max_depth ? mounthole_max_depth : mounthole_depth+1; filament_elevation=protrusion_h+pulley_elevation+teeth_elevation; ls_z = filament_elevation; // leverspace mid-z ls_h = lever_thickness+lever_v_clearance; // leverspace height mount_depth = mount_screw_l - (ls_z+ls_h/2+min_z_shell); @@ -327,78 +326,68 @@ module the_extruder( // back side cutout // XXX: this is somewhat ugly and potentially bugged, // but I want to sleep. a0_ = atan( (mount_d/sqrt(2)/2+mount_screw_d+pf_h(pf)+gearbox_d/2) / ( pulley_d/2+filament_offset- (pf_d(pf)+2*pf_shell)/2/cos(30) ) ); a0 = -135 + ( (a0_>0) ? a0_ : 180+a0_ ); a1 = atan((longwing-lever_thickness/2)/(gearbox_d/2)); translate([0,0,ls_z]) difference() { rotate([0,0,-180+a0]) rotate_extrude(angle=a1-a0) translate([0,-ls_h/2]) square([sqrt(pow(gearbox_d/2,2)+pow(longwing-lever_thickness/2,2))+1, ls_h]); translate([-mount_d/2,0,0]) cylinder(d=gearbox_d-mount_d,h=ls_h+2,center=true,$fn=fnd*(gearbox_d-mount_d)); }//difference translate - //translate([-mount_d/2,-longwing,filament_elevation]) - if(!tensioner) /* XXX: this seems to be bullshit, but it's so old, that it's historical bullshit */ - translate([mount_d/2,-longwing,filament_elevation]) - rotate([0,-90,0]) difference() { - cylinder(d=spring_d+spring_d_clearance,h=spring_lc+spring_dl,$fn=fnd*(spring_d+spring_d_clearance)); - translate([0,0,spring_lc+spring_dl]) sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4); - } - // spring tensioner translate([-gearbox_d/2,-longwing,ls_z]) rotate([0,-90,0]) { - if(!tensioner) finger_indent(d=lever_thickness-1,r=15); else { mirror([0,0,1]) { translate([0,0,st_thickshell]) hull() for(o=[0,spring_d]) translate([0,-o,0]) rotate([0,0,30]) cylinder(d=st_nut_d+st_nut_d_tolerance,h=st_nut_h+st_nut_h_tolerance,$fn=6); translate([0,0,-1]) cylinder(d=st_screw_d+st_screw_d_tolerance,h=fsw+2,$fn=fnd*(st_screw_d+st_screw_d_tolerance)); bigd = spring_d+spring_d_clearance; hf = (bigd-st_screw_d-st_screw_d_tolerance)/2; translate([0,0,st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell-epsilon]) { cylinder(d1=st_screw_d+st_screw_d_tolerance,d2=bigd, h=hf+epsilon, $fn=fnd*bigd); translate([0,-(st_thinshell+st_split_w_tolerance)/2,0]) cube(size=[body_h-ls_z+1,st_thinshell+st_split_w_tolerance,fsw+1]); - } + }//translate translate([0,0,st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell+hf-epsilon]) cylinder(d=bigd,h=fsw+1,$fn=fnd*bigd); - } - } - } + }//mirror + }//translate }//difference }//body module module springpad() { smalld=st_screw_d+st_screw_d_tolerance+min_xy_shell; bigd = spring_d+spring_d_clearance/2; hf = (bigd-smalld)/2; h = hf*3.5; translate([-gearbox_d/2+st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell+1,-longwing,filament_elevation]) rotate([0,90,0]) difference() { union() { cylinder(d1=smalld,d2=bigd,h=hf,$fn=fnd*bigd); translate([0,0,hf-epsilon]) cylinder(d=bigd,h=h-hf,$fn=fnd*bigd); translate([0,0,h]) sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4); l = body_h-ls_z; w = st_thinshell; hull() translate([0,-st_thinshell/2,0]) mirror([1,0,0]) { translate([0,0,w]) cube(size=[l,st_thinshell,w]); cube(size=[l-w,st_thinshell,2*w]); @@ -421,49 +410,49 @@ module the_extruder( cube([bore_d+2,bore_d/2,knob_bore_l+4]); } } } difference() { union() { cylinder(d1=gearbox_d-2*ch,d2=gearbox_d,h=ch+epsilon,$fn=fnd*gearbox_d); translate([0,0,ch]) cylinder(d=gearbox_d,h=knob_h-2*ch+epsilon,$fn=fnd*gearbox_d); translate([0,0,knob_h-ch]) cylinder(d1=gearbox_d,d2=gearbox_d-2*ch,h=ch,$fn=fnd*gearbox_d); } for(a=[0:360/knob_indents:359]) rotate([0,0,a]) translate([0,gearbox_d/2,-1]) cylinder(d=knob_indent_d,h=knob_h+2,$fn=fnd*knob_indent_d); } } }//knob module module debug() { difference() { children(); if(debug) { // spring tensioner debug cutout - if(tensioner) // TODO: collapse copypasted transformations + // TODO: collapse copypasted transformations translate([-gearbox_d/2,0,0]) translate([0,-longwing,ls_z]) rotate([0,-90,0]) translate([0,-lever_thickness/2-1,-gearbox_d]) cube(size=[body_h/2+1,lever_thickness/2+1,gearbox_d+2]); // lever axis debug cutout translate([mount_d/2,0,-1]) rotate([0,0,-45]) cube(size=[gearbox_d-mount_d,gearbox_d-mount_d,body_h+knob_h+2]); // idler debug cutout translate([0,0,ls_z]) place_idler() rotate([0,0,-45]) translate([0,0,-lever_thickness/2-epsilon]) cube(size=[(idler_d+idler_clearance)/2,(idler_d+idler_clearance)/2, lever_thickness+2*epsilon]); // pushfit debug cutout place_idler() translate([-idler_d/2+filament_offset,0,ls_z]) cube(size=[gearbox_d/2,gearbox_d/2+pf_h(pf),body_h-ls_z+1]); }//if debug }//difference } mirrorleft() |