chiark / gitweb /
bike-lipo-box: rotate again so glands are at front for viewing while printing
[reprap-play.git] / filamentspool.scad
index 37edb6b..fe29eea 100644 (file)
 // -*- C -*-
 
-fdia=2.85;
+// filamentspool.scad
+// 3D design for filament spools to hold coils as supplied by Faberdashery
+//
+
+//
+// Copyright 2012,2013,2016 Ian Jackson
+//
+// This work is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This work is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this work.  If not, see <http://www.gnu.org/licenses/>
+//
+
+//
+// Each spool is a hub with 3 or 4 arms.  Each arm has a cup for
+// holding the filament.  The effective diameter can be adjusted by
+// setting the cup into a different seat in the arm.  The cups are
+// held on with simple clips, so the filement coil can easily be
+// removed and replaced.
+//
+// This file (and its includes) can generate:
+//
+// ===== Heavy duty 4-armed spool for 3mm x 100m coil =====
+//
+// A heavy duty 4-armed spool suitable for holding a 100m
+// Faberdashery coil on the spool arm of a Lulzbot TAZ-5.
+//
+//     Set
+//           fdia=2.85
+//           lightduty=false
+//     And print following parts
+//            Hub
+//            ArmEnd x 4
+//            FilamentCup x 4  (or FilamentCupPair x 2)
+//            CupSecuringClip x 4
+//
+//     You will also need  4 x M4 machine screws and nuts.
+//
+//     This is the default.
+//
+// ===== Light duty 3-armed spool for 3mm x <=30m coil =====
+//
+// A light duty 3-armed spool suitable for up to around 30m
+// of Faberdashery 2.85mm PLA.
+//
+//     Set
+//           fdia=2.85
+//           lightduty=true
+//     (or look in filamentspool-lt.scad).
+//
+//     And print following parts
+//           Hub
+//           ArmEnd x 3
+//           FilamentCup x 3  (or FilamentCup + FilamentCupPair)
+//           CupSecuringClip x 3
+//           TowerDoveClipPin x 6
+//
+//     When assembling, insert one TowerDoveClipPin from each side,
+//     joining each ArmEnd to the Hub with two TowerDoveClipPins.
+//     Modest force with pliers is good to seat them properly.
+//
+//     (note that the light duty and heavy duty CupSecuringClips
+//      are slightly different)
+//
+// ===== Notes regarding both the above spools =====
+//
+// When mounting either spool on the TAZ-5 spool arm, put the `pointy'
+// end of the hub towards the printer - ie, put put the spool on
+// `backwards'.  This ensures that the spool's arms will clear the
+// printer framework.
+//
+// For the above, I generally used the Cura `Standard' PLA profile.
+//
+// ===== TAZ-5 feed tube adjustment kit =====
+//
+// With a TAZ-5 I recommend using this kit to improve the feed
+// reliability:
+//
+//       Set
+//           fdia=2.85
+//     And print following parts
+//           FilamentGuideSpacer (ideally, at `high detail')
+//           FilamentGuideArmPrint (optional; `high detail' or `standard')
+//
+//     And possibly also
+//           t-nut_jig_0.2.stl
+//     from Aleph Objects - look here:
+//           http://download.lulzbot.com/TAZ/accessories/tool_heads/version_2/Dual_Extruder_v2/production_parts/stl/
+//
+// The spacer clips onto the filament guide tube holder arm, on the
+// inside, with the pointy flanged end towards the filament guide
+// tube.  It stops the filament guide tube angle (and so the
+// filament's natural pickup location) changing as the print head moves.
+//
+// The FilamentGuideArm[Print] is a replacement for the arm supplied
+// with your TAZ-5.  It's longer, so that the filament pickup point is
+// closer to the middle of the coil.  Use the t-nut_jig to stop the
+// T-nuts in the aluminium channel from annoyingly sliding down to the
+// bottom while you swap out the arm.
+//
+// (Faberdashery coils, and therefore both the above spools, have a
+// larger diameter than the flat-walled spools often supplied by other
+// vendors.  And the spools above have individual arms rather than a
+// continuous disc.  If the filament `unhooks' from the arm, it can
+// pull taught around the hub and stop feeding properly.)
+//
+// ===== Spool storage arm, for mounting on walls =====
+//
+// A storage arm suitable for screwing to walls, bookshelves,
+// etc. (requires non-countersunk M4 screws); will hold two heavy duty
+// spools each with a 100m coil.
+//
+//     Set
+//           fdia=2.85
+//           lightduty=false
+//     (or look in filamentspool-sm.scad).
+//
+//     And print one of these, according to taste
+//            StorageArmLeft
+//            StorageArmRight
+//
+//     NB that the `light duty' version of this is shorter and
+//     will only take two `light duty' spools.
+//
+// For the above, I used the Cura `High detail' PLA profile because
+// I wanted it pretty, but the `Standard' profile should do fine.
+//
+// ===== Spools for 1.75mm filament =====
+//
+// Spool (in many parts) for handing 1.75mm filament, printable
+// on, and with parts for mounting on, a Reprappro Huxley.
+
+
+fdia=2.85; // or 1.75
+lightduty=false; // or true
+
 
 slop=0.5;
 bigslop=slop*2;
 
-function selsz(sm,lg) = fdia < 2 ? sm : lg;
-function usedove() = selsz(true,false);
+function selsz(sm,lt,lg) = fdia < 2 ? sm : lightduty ? lt : lg;
+function usedove() = selsz(true,true,false);
+
+num_arms = selsz(3,3,4);
 
-num_arms = selsz(3,4);
+channelslop=selsz(slop,0.75,slop);
 
 exteffrad = 70;
-hubeffrad = selsz(30, 50);
-hubbigrad = selsz(20, 45);
-hublwidth = selsz(3, 5);
+hubeffrad = selsz(30, 82, 40);
+hubbigrad = selsz(20, 38, 38);
+hublwidth = selsz(3, 2.5, 3.0);
 hubstemwidth = 2;
 hublthick = 10;
-hubaxlerad = selsz(5, 17/2);
+hubaxlerad = selsz(5, 28/2, 28/2);
 totalheightfromtower = 240;
 axletowerfudgebend = 0;
 axleaxlefudgebend = 3;
@@ -24,22 +169,22 @@ axlepadlen = 1.0;
 
 armend_length = 120;
 
-prongthick=selsz(5,5);
-prongwidth=selsz(5,5);
+prongthick=selsz(5,4,5);
+prongwidth=selsz(5,4,5);
 prongribwidth=3;
-prongribheight=selsz(0,4);
+prongribheight=selsz(0,0,4);
 ratchetstep=15;
 ratchettooth=3;
 ratchettoothheight=5;
 ratchettoothsmoothr=1;
 ratchettoothslope=0.75;
 overlap=0.5;
-cupwidth=selsz(40,50);
-cupheight=selsz(55,55);
+cupwidth=selsz(40,25,50);
+cupheight=selsz(55,25,55);
 
-cupstrong_dx=selsz(0,-10);
+cupstrong_dx=selsz(0,0,-10);
 
-propxshift = 0;
+propxshift = -6;
 
 doveclipheight = 10;
 
@@ -48,25 +193,31 @@ teethgapx=4+fdia;
 
 prongstalkxwidth=3;
 
-stalklength=selsz(35,55);
+stalklength=selsz(35,25,55);
 overclipcupgap=5;
 overclipdepth=15;
 overcliproundr=2.0;
 overclipthick=1.0;
-overclipcupnextgap=20;
+overclipcupnextgap=selsz(20,15,20);
 
-hubaxlelen = selsz(25, cupwidth*.75 + 20);
+hubaxlelen = selsz(25, 62.5, 77.5);
 echo(hubaxlelen);
 
 overclipsmaller=-2.5;
 overclipbigger=0.0;
 
-wingspoke=3;
+wingspoke=2.5;
 wingsize=6;
 wingthick=3;
 
-armendwallthick=2.5;
-armendbasethick=1.2;
+armendwallthick=selsz(2.5, 1.8, 2.5);
+armendbasethick=selsz(1.2, 1.2, 1.2);
+
+numbers_relief = 0.7;
+numbers_tick_len = 8;
+numbers_tick_width = 0.75;
+numbers_tick_linespc = 1.0;
+numbers_height_allow = 8;
 
 axlehorizoffset = 12.5;
 axlevertheight = 100;
@@ -89,7 +240,7 @@ ratchetpawl=ratchetstep-ratchettooth-bigslop*2;
 nondove_armhole_x = 32;
 nondove_armhole_hole = 4 + 0.8;
 nondove_armhole_support = 7;
-nondove_armhole_wall = 4;
+nondove_armhole_wall = 3.2;
 nondove_armhole_slop = 0.5;
 nondove_armhole_slop_x = 0.5;
 
@@ -101,13 +252,23 @@ include <doveclip.scad>
 include <cliphook.scad>
 include <filamentteeth.scad>
 include <axlepin.scad>
+include <commitid.scad>
+
+hub_clip_baseextend = (hubeffrad - DoveClip_depth()
+                      - hubbigrad + hublwidth);
+
+real_exteffrad = selsz(exteffrad + hub_clip_baseextend,
+                      hubeffrad + DoveClip_depth(),
+                      hubeffrad + nondove_armbase);
 
-channelwidth = prongthick + slop;
+channelwidth = prongthick + channelslop;
 channeldepth = prongwidth + ratchettoothheight;
 totalwidth = armendwallthick*2 + channelwidth;
 totalheight = channeldepth + armendbasethick;
 stalkwidth = prongwidth + prongstalkxwidth;
 
+tau = PI*2;
+
 module ArmEnd(length=armend_length){ ////toplevel
   if (usedove()) {
     translate([ratchettoothsmoothr, channelwidth/2, -armendbasethick]) {
@@ -123,27 +284,68 @@ module ArmEnd(length=armend_length){ ////toplevel
                 -armendwallthick + totalwidth/2,
                 -armendbasethick -1])
        cylinder(r= nondove_armhole_hole/2, h=totalheight+2, $fn=10);
+      translate([-nondove_armbase, -armendwallthick, -armendbasethick])
+        rotate([90,0,0])
+       Commitid_BestCount([nondove_armbase, totalwidth]);
     }
   }
 
   difference(){
-    translate([0, -armendwallthick, -armendbasethick])
-      cube([length, totalwidth, totalheight]);
-    translate([-1, 0, 0])
-      cube([length+1 - ratchettooth, channelwidth, channeldepth+1]);
-    translate([-1, 0, ratchettoothheight])
-      cube([length+2, channelwidth, channeldepth+1]);
-  }
-  for (dx = [0 : ratchetstep : length - ratchetstep]) translate([dx,0,0]) {
-    translate([ratchettoothsmoothr+0.5, armendwallthick/2, 0]) minkowski(){
-      rotate([90,0,0])
-       cylinder($fn=20, r=ratchettoothsmoothr, h=armendwallthick);
-      multmatrix([     [       1, 0, ratchettoothslope, 0      ],
-                       [       0,      1,      0,      0       ],
-                       [       0,      0,      1,      0       ],
-                       [       0,      0,      0,      1       ]])
-       cube([ratchettooth - ratchettoothsmoothr*2,
-             channelwidth, ratchettoothheight - ratchettoothsmoothr]);
+    union(){
+      difference(){
+       translate([0, -armendwallthick, -armendbasethick])
+         cube([length, totalwidth, totalheight]);
+       translate([-1, 0, 0])
+         cube([length+1 - ratchettooth, channelwidth, channeldepth+1]);
+       translate([-1, 0, ratchettoothheight])
+         cube([length+2, channelwidth, channeldepth+1]);
+      }
+      for (dx = [0 : ratchetstep : length - ratchetstep]) translate([dx,0,0]) {
+       translate([ratchettoothsmoothr+0.5, armendwallthick/2, 0]) minkowski(){
+         rotate([90,0,0])
+           cylinder($fn=20, r=ratchettoothsmoothr, h=armendwallthick);
+         multmatrix([  [       1, 0, ratchettoothslope, 0      ],
+                           [   0,      1,      0,      0       ],
+                           [   0,      0,      1,      0       ],
+                           [   0,      0,      0,      1       ]])
+           cube([ratchettooth - ratchettoothsmoothr*2,
+                 channelwidth, ratchettoothheight - ratchettoothsmoothr]);
+       }
+      }
+    }
+
+    for (otherside=[0,1]) {
+      for (circum = [300:100:1500]) {
+       assign(rad = circum / tau)
+         assign(fn = str("filamentspool-number-n",circum,".dxf"))
+         assign(rotateoffset = [0, totalwidth/2, 0])
+         assign(xlen = rad - real_exteffrad) {
+         if (xlen >= numbers_tick_width/2
+             + (otherside ? numbers_height_allow : 0) &&
+             xlen <= length - (otherside ? 0 : numbers_height_allow))
+           translate([xlen, -armendwallthick,
+                      -armendbasethick + (totalheight - numbers_tick_len)/2])
+           translate(rotateoffset)
+           rotate([0,0, otherside*180])
+           translate(-rotateoffset){
+             translate([-numbers_tick_width/2, -1, 0])
+               cube([numbers_tick_width, numbers_relief+1, numbers_tick_len]);
+             translate([numbers_tick_width/2 + numbers_tick_linespc,
+                        1,
+                        numbers_tick_len])
+               rotate([90,0,0])
+               rotate([0,0,-90])
+               linear_extrude(height= numbers_relief+1)
+               //    scale(templatescale)
+               import(file=fn, convexity=100);
+           }
+       }
+      }
+    }
+
+    if (usedove()){
+      translate([0, -armendwallthick, -armendbasethick])
+       Commitid_BestCount_M([length/3, totalwidth]);
     }
   }
 }
@@ -176,7 +378,7 @@ module FilamentCupCup(){
   }
 }
 
-module FilamentCup() { ////toplevel
+module FilamentCupPositive() {
   FilamentCupHandle();
 
   gapy = prongwidth;
@@ -231,6 +433,14 @@ module FilamentCup() { ////toplevel
   }      
 }
 
+module FilamentCup() { ////toplevel
+  difference(){
+    FilamentCupPositive();
+    translate([0, -stalkwidth, 0])
+      Commitid_BestCount_M([stalklength - stalkwidth, stalkwidth]);
+  }
+}
+
 module CupSecuringClipSolid(w,d,h1,h2){
   rotate([0,-90,0]) translate([0,-h1/2,-w/2]) linear_extrude(height=w) {
     polygon(points=[[0,0], [d,0], [d,h2], [0,h1]]);
@@ -288,35 +498,34 @@ module Hub(){ ////toplevel
       cylinder(h=hubaxlelen, r=axlerad+hublwidth);
       for (ang=[0 : 360/num_arms : 359])
        rotate([0,0,ang]) {
-         difference() {
-           if (usedove()){
+         if (usedove()){
+           difference() {
              translate([hubeffrad,0,0])
                DoveClipPairSane(h=doveclipheight,
-                                baseextend = (hubeffrad - DoveClip_depth()
-                                              - hubbigrad + hublwidth));
+                                baseextend = hub_clip_baseextend);
              if (hole>hublwidth && holewidth > 2) {
                translate([hubbigrad + hublwidth, -holewidth/2, -1])
                  cube([hole, holewidth, hublthick+2]);
              }
-           } else {
-             difference(){
-               translate([0,
-                          -nondove_allwidth/2,
-                          0])
-                 cube([hubeffrad + nondove_armhole_x
-                       + nondove_armhole_hole/2 + nondove_armhole_support,
-                       nondove_allwidth,
-                       nondove_armhole_wall + totalheight]);
-               translate([hubeffrad - nondove_armhole_slop_x,
-                          -nondove_allwidth/2
-                          + nondove_armhole_wall - nondove_armhole_slop,
-                          nondove_armhole_wall])
-                 cube([nondove_armhole_x + 50,
-                       totalwidth + nondove_armhole_slop*2,
-                       totalheight + 1]);
-               translate([hubeffrad + nondove_armhole_x, 0, -20])
-                  cylinder(r= nondove_armhole_hole/2, h=50, $fn=10);
-             }
+           }
+         } else {
+           difference(){
+             translate([0,
+                        -nondove_allwidth/2,
+                        0])
+               cube([hubeffrad + nondove_armhole_x
+                     + nondove_armhole_hole/2 + nondove_armhole_support,
+                     nondove_allwidth,
+                     nondove_armhole_wall + totalheight]);
+             translate([hubeffrad - nondove_armhole_slop_x,
+                        -nondove_allwidth/2
+                        + nondove_armhole_wall - nondove_armhole_slop,
+                        nondove_armhole_wall])
+               cube([nondove_armhole_x + 50,
+                     totalwidth + nondove_armhole_slop*2,
+                     totalheight + 1]);
+             translate([hubeffrad + nondove_armhole_x, 0, -20])
+               cylinder(r= nondove_armhole_hole/2, h=50, $fn=10);
            }
          }
        }
@@ -329,6 +538,16 @@ module Hub(){ ////toplevel
        }
     }
     translate([0,0,-1]) cylinder($fn=60, h=hubaxlelen+2, r=axlerad);
+
+    rotate([0,0, selsz(0,0,45)])
+      translate([axlerad+hublwidth,
+                -hublwidth/2,
+                0])
+      rotate([90,0,0])
+      Commitid_BestCount([(hubbigrad-hublwidth) - (axlerad+hublwidth),
+                         hublthick +
+                         hublwidth/2 * hubaxlelen/(hubbigrad-axlerad),
+                         ]);
   }
 }
 
@@ -448,6 +667,326 @@ module FilamentCupPair(){ ////toplevel
     rotate([0,0,180]) FilamentCup();
 }
 
+//----- storarm -----
+
+storarm_hooklen = 8;
+storarm_hookheight = 5;
+storarm_thick = 10;
+storarm_axleslop = 4;
+
+storarm_base_w = 30;
+storarm_base_h = 100;
+storarm_base_d = 15;
+storarm_base_mind = 2;
+
+storarm_cope_hubaxle_mk1 = true;
+
+storarm_screw_hole = 4;
+storarm_screw_hole_slop = 0.5;
+storarm_besides_hole = 4;
+
+storarm_under_hole = 5;
+storarm_screw_hole_head = 8.8;
+storarm_screw_hole_head_slop = 1.5;
+
+// calculated
+
+storarm_axlerad = hubaxlerad - storarm_axleslop;
+storarm_mainlen = hubaxlelen*2 + storarm_axleslop
+  + (storarm_cope_hubaxle_mk1 ? 10 : 0);
+storarm_totlen = storarm_mainlen + storarm_hooklen;
+
+storarm_mid_off_y = storarm_axlerad;
+
+storarm_base_off_y = storarm_mid_off_y + storarm_base_h/2;
+
+module StorageArmDiagPartSide(xmin, xmax){
+  xsz = xmax-xmin;
+  yuse = storarm_thick/2;
+
+  intersection(){
+    translate([xmin-1, -storarm_axlerad, storarm_thick/2])
+      rotate([0,90,0])
+      cylinder(r=storarm_axlerad, h=xsz+2, $fn=60);
+    translate([xmin, -yuse, 0])
+      cube([xsz, yuse, storarm_thick]);
+  }
+}
+
+module StorageArmDiagPart(xmin, xmax, shear, adjbot){
+  hull(){
+    StorageArmDiagPartSide(xmin,xmax);
+
+    multmatrix([[1,0,0,0],
+               [shear,1,0,0],
+               [0,0,1,0],
+               [0,0,0,1]])
+      translate([0, -storarm_axlerad*2 + adjbot, 0])
+      mirror([0,1,0])
+      StorageArmDiagPartSide(xmin,xmax);
+  }
+}
+
+module StorageArmBaseTemplate(){
+  square([storarm_base_w, storarm_base_h]);
+}
+
+module StorageArmAtMountingHoles(){
+  bes = storarm_besides_hole + storarm_screw_hole;
+
+  x0 = bes;
+  x1 = storarm_base_w-bes;
+  y1 = storarm_base_h - bes;
+  y0 = bes;
+
+  for (pos=[ [x0, y1],
+            [x1, y1],
+            [x1, y0] ]) {
+    rotate([0,90,0])
+      translate([pos[0] - storarm_base_w,
+                pos[1] - storarm_base_off_y, -storarm_base_d])
+      children();
+  }
+}
+
+module StorageArmRight(){ ////toplevel
+  shear = storarm_hookheight / (storarm_mainlen/2);
+
+  StorageArmDiagPart(-1, storarm_mainlen/2+1, shear, 0);
+  StorageArmDiagPart(storarm_mainlen/2-1, storarm_mainlen+1, shear/2,
+                    storarm_hookheight/2);
+
+  translate([0, storarm_hookheight, 0])
+    StorageArmDiagPart(storarm_mainlen, storarm_totlen,
+                      shear/2, -storarm_hookheight/2);
+
+  difference(){
+    union(){
+      hull(){
+       translate([-storarm_base_d, -storarm_base_off_y, storarm_base_w])
+         rotate([0,90,0])
+         linear_extrude(height=storarm_base_mind)
+         StorageArmBaseTemplate();
+       StorageArmDiagPart(-1, 0, shear, 0);
+      }
+      StorageArmAtMountingHoles(){
+       cylinder(r= storarm_screw_hole_head/2,
+                h=10);
+      }
+    }
+    StorageArmAtMountingHoles(){
+      translate([0,0,-1])
+       cylinder(r= (storarm_screw_hole + storarm_screw_hole_slop)/2 ,
+                h=20);
+      translate([0,0,storarm_under_hole])
+       cylinder(r= (storarm_screw_hole_head + storarm_screw_hole_head_slop)/2,
+                h=20);
+    }
+  }
+}
+
+module StorageArmLeft(){ ////toplevel
+  mirror([1,0,0]) StorageArmRight();
+}
+
+module StorArmHoleTest(){ ////toplevel
+  sz = storarm_screw_hole_head + storarm_besides_hole*2;
+  intersection(){
+    StorageArmRight();
+    translate([-50, -storarm_base_off_y, -1])
+      cube([100, sz, sz+1]);
+  }
+}
+
+
+//----- filament guide spacer -----
+
+guide_armdia = 15.0;
+guide_armwidth = 10.2;
+guide_armcorelen = 25.0;
+guide_clipcirclethick = 10.0;
+
+guidefilclip_outerdia = 22.8;
+
+guidespacer_armslop = 0.75;
+guidespacer_armlenslop = 1.05;
+
+guidespacer_prongprotrude = 4;
+guidespacer_thick = 1.6;
+
+// calculated
+
+guidespacer_armdia = guide_armdia + guidespacer_armslop;
+guidespacer_armwidth = guide_armwidth + guidespacer_armslop;
+guidespacer_len = guide_armcorelen - guide_clipcirclethick
+  + guidespacer_armlenslop;
+
+guidespacer_wingheight = (guidefilclip_outerdia - guidespacer_armdia)/2;
+
+module FilamentGuideArmTemplate(extra=0){
+  intersection(){
+    circle(r= (guidespacer_armdia/2) + extra);
+    square(center=true, [guidespacer_armwidth+extra*2,
+                        guidespacer_armdia + extra*2 + 10]);
+  }
+}
+
+module FilamentGuideSpacerInnerTemplate(){
+  FilamentGuideArmTemplate();
+  translate([0, -guidespacer_armdia/2])
+    square(center=true, [guidespacer_armwidth - guidespacer_prongprotrude,
+                        guidespacer_armdia]);
+}
+
+module FilamentGuideSpacer(){ ////toplevel
+  difference(){
+    union(){
+      linear_extrude(height= guidespacer_len)
+       FilamentGuideArmTemplate(extra= guidespacer_thick);
+      for (angle=[26, 60]) {
+       for (m=[0,1]) {
+         mirror([m,0,0]) {
+           rotate([0,0,angle]) {
+             hull(){
+               for (t=[[0, guidespacer_wingheight],
+                       [guidespacer_len-1, -guidespacer_wingheight]])
+                 translate([0,0, t[0] + 0.5])
+                   cube([guidespacer_thick, guidespacer_armdia + t[1]*2,
+                     1],
+                        center=true);
+             }
+           }
+         }
+       }
+      }
+    }
+    translate([0,0,-1])
+      linear_extrude(height= guidespacer_len+5)
+      FilamentGuideSpacerInnerTemplate();
+  }
+}
+
+
+//----- replacement filament guide arm for TAZ-5 -----
+
+guidearm_armslop = 0.25;
+guidearm_armlenslop = 0.25;
+
+guidearm_hookprotr = 3;
+guidearm_hookprotrflat = 1;
+guidearm_hookslope = 0.3;
+
+guidearm_totallen = 60;
+
+guidearm_screwplatesz = 12;
+guidearm_screwplateth = 4;
+guidearm_screwplatewd = 15;
+guidearm_screwhole = 5 + 0.5;
+
+guidearm_bendlen = 40;
+guidearm_bendslot = 4.5;
+
+guidearm_stopthick = 4;
+guidearm_protrslop = 1.0;
+
+// calculated
+
+guidearm_armdia = guide_armdia - guidearm_armslop;
+guidearm_armwidth = guide_armwidth - guidearm_armslop;
+guidearm_armcorelen = guide_armcorelen + guidearm_armlenslop;
+
+guidearm_base_z0 = -(guidearm_totallen - guidearm_armcorelen);
+
+guidearm_realbendlen = min(guidearm_bendlen,
+                          guidearm_totallen - guidearm_screwplateth - 0.1);
+guidearm_slopelen = guidearm_hookprotr/guidearm_hookslope;
+
+module FilamentGuideArmStop(h){
+  for (ts=[-1,+1]) {
+    translate([ts * guidearm_hookprotr, 0,0])
+      cylinder(r=guidearm_armdia/2, h, $fn=80);
+  }
+}
+
+module FilamentGuideArmShaftPositive(){
+  r = guidearm_armdia/2;
+
+  translate([0,0, guidearm_base_z0+1])
+    cylinder(r=r, h= guidearm_totallen, $fn=80);
+  translate([0,0, guidearm_armcorelen]){
+    hull(){
+      FilamentGuideArmStop(guidearm_hookprotrflat);
+      translate([0,0, guidearm_slopelen])
+       cylinder(r=r, h=guidearm_hookprotrflat, $fn=80);
+    }
+  }
+  mirror([0,0,1])
+    FilamentGuideArmStop(guidearm_stopthick);
+}
+
+module FilamentGuideArmBase(){
+  translate([0,
+            (guidearm_screwplatewd - guidearm_armwidth)/2,
+            guidearm_base_z0]){
+    difference(){
+      translate([0,0, guidearm_screwplateth/2])
+       cube(center=true,
+            [guidearm_armdia + guidearm_screwplatesz*2,
+             guidearm_screwplatewd,
+             guidearm_screwplateth]);
+      for (ts=[-1,+1]) {
+       translate([ts * (guidearm_armdia/2 + guidearm_screwplatesz/2),
+                  0,
+                  -20])
+         cylinder(r= guidearm_screwhole/2, h=40, $fn=20);
+      }
+    }
+  }
+}
+
+module FilamentGuideArm(){ ///toplevel
+  intersection(){
+    difference(){
+      FilamentGuideArmShaftPositive();
+      translate([-guidearm_bendslot/2,
+                -50,
+                -guidearm_realbendlen + guidearm_armcorelen])
+       cube([guidearm_bendslot,
+             100,
+             guidearm_realbendlen + 100]);
+      hull(){
+       for (zx=[ [ 0, guidearm_bendslot ],
+                 [ guidearm_armcorelen + guidearm_slopelen,
+                   guidearm_hookprotr*2 + guidearm_protrslop ]
+                 ]) {
+         translate([-zx[1]/2, -50, zx[0]])
+         cube([zx[1], 100, 1]);
+       }
+      }
+    }
+    cube(center=true,
+        [guidearm_armdia*2,
+         guidearm_armwidth,
+         guidearm_totallen*3]);
+  }
+  FilamentGuideArmBase();
+}
+
+module FilamentGuideArmPrint(){ ////toplevel
+  rotate([90,0,0])
+    FilamentGuideArm();
+}
+
+module Demo(){ ////toplevel
+  translate([-real_exteffrad,-20,0]) Hub();
+  ArmEnd();
+  translate([ratchettooth*2, 30, 0]) FilamentCup();
+  if (selsz(true,false,false)) {
+    translate([-exteffrad + hubeffrad - hub_clip_baseextend, -10, 0])
+      ArmExtender();
+  }
+}
+
 //ArmEnd();
 //FilamentCup();
 //FilamentCupPair();
@@ -458,3 +997,9 @@ module FilamentCupPair(){ ////toplevel
 //AxleWasher();
 //AxlePin();
 //AxleFrictionWasher();
+//StorageArmLeft();
+//StorArmHoleTest();
+//FilamentGuideSpacer();
+//FilamentGuideArm();
+//FilamentGuideArmPrint();
+//Demo();