/
extruder_drive.scad
402 lines (334 loc) · 11.5 KB
/
extruder_drive.scad
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
/*
extruder_drive.scad is a derivative of the MOST extruder drive
Copyright (C) 2015 Gerald Anzalone
This program 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 program 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 program. If not, see <http://www.gnu.org/licenses/>.
MOST extruder drive derived from:
Airtripper's Bowden 3D Printer Extruder Revision 3
by Airtripper May � 2012
airtripper.com
*/
// includes may be downloaded from https://github.com/phidiasllc/scad_libraries
include<fasteners.scad>
include<bearings.scad>
include<steppers.scad>
include<threads.scad>
$fn = 48;
t_feet = 5; // thickness of the mounting feet
t_base = 4.7; // thickness of the extruder block's back plate
// rather than rewrite everything (should do that anyway) the following is a total hack
z_bearing = 8.5; // unexplainable number based on original design - moves the whole bearing housing - originally 9.8mm scattered throughout design
module axle_8mm() {
cylinder(16,r=3.80, $fn=40);
// Support flange while printing
translate([-5,-0.5,0]) cube([10,1,1]);
translate([-0.5,-5,0]) cube([1,10,1]);
difference() {
cylinder(1,r=10, $fn=40);
translate([0,0,-1]) cylinder(3,r=5, $fn=40);
}
}
module extruder_idler_608z() {
r_idler = 6;
//translate([0,0,6]) rotate([0,90,0]) bearing(8, 22, 7);
difference() {
union() {
difference() {
translate([0,0,7]) cube([20,42,14], center = true);
// Bearing housing
//translate([-6,0,8]) cube([10,50,20], center = true);
translate([0,0,1]) cube([10,24,10], center = true);
translate([-5,0,6]) rotate([0,90,0]) cylinder(10,r=12, $fn=60);
}
// Axle spacer
translate([-8,0,6]) rotate([0,90,0]) cylinder(16,r=6, $fn=40);
translate([0,0,3]) cube([16,12,6], center = true);
}
union() {
// Bearing axle cut-out
translate([-8,0,6]) rotate([0,90,0]) cylinder(16,r=4.25, $fn=40);
translate([0,0,2]) cube([16,8.5,8], center = true);
translate([-3.6,0,6]) rotate([0,90,0]) cylinder(7.2,r=12, $fn=60);
// hook
translate([-9,-15.5,6]) rotate([0,90,0]) cylinder(22,r=2, $fn=25);
translate([0,-18.5,11]) cube([22,10,10], center = true);
translate([9,-17,1]) cube([3,16,16], center = true);
translate([-9,-17,1]) cube([3,16,16], center = true);
translate([0,-21,0]) rotate([45,0,0]) cube([24,6,10], center = true);
translate([-11,-12,9.6]) rotate([0,135,0]) cube([4,6,6], center = true);
translate([11,-12,9.6]) rotate([0,45,0]) cube([4,6,6], center = true);
// Bolt slots
translate([6,20,7]) cube([3.5,10,16], center = true);
translate([-6,20,7]) cube([3.5,10,16], center = true);
translate([0,24,7]) rotate([154,0,0]) cube([22,10,26], center = true);
translate([0,26.5,25]) rotate([145,0,0]) cube([22,10,26], center = true);
translate([0,25.5,7]) cube([22,10,16], center = true);
//Padding
//translate([-9,-17,7]) cube([6,10,16], center = true);
}
}
}
module drive_body(
d_retainer,
h_retainer,
d_sheath,
d_filament,
t_feet,
t_base,
quick_release = false,
short_feed = false) {
r_mounts = r_mounts(cc_NEMA17_mount);
difference() {
union() {
// Extruder base
if (t_base > 0)
difference() {
hull()
for(i = [1:4])
rotate([0, 0, i * 90 + 45])
translate([r_mounts, 0, 0])
cylinder(r = 6, h = t_base);
// thin the base on the side opposite the preload idler
translate([-45, -25, 2])
cube([50, 50, t_base]);
}
// webs for bearing housing support
translate([0, 0, (t_base > 3) ? z_bearing + 7.7 + t_base : z_bearing + 10.7])
for (i = [-1, 1])
rotate([0, 0, i * 45])
hull() {
translate([-6, 0, 0])
cylinder(r = 2, h = 3);
translate([-r_mounts, 0, 0])
cylinder(r = 4.5, h = 3);
}
// web for outfeed support
hull() {
translate([-cc_NEMA17_mount / 2, 12.5, 0])
cylinder(r = 1.5, h = 19);
translate([-1, 12.5, 0])
cylinder(r = 1.5, h = 26);
}
translate([0, 0, (t_base > 3) ? z_bearing + t_base - 3 : z_bearing])
bearing_housing_body();
translate([tweak_path, 0, (t_base > 3) ? t_base - 3 : 0])
filament_path(
d_retainer = d_retainer,
h_retainer = h_retainer,
d_sheath = d_sheath,
d_filament = d_filament,
offset_filament = offset_filament,
quick_release = quick_release,
short_feed = short_feed
);
// M3 Screw columns for stepper attachment
for (i = [-1, 1])
translate([-cc_NEMA17_mount / 2, i * cc_NEMA17_mount / 2, 0])
cylinder(r = 4.5, h = (t_base > 3) ? 9 + z_bearing + t_base : 12 + z_bearing); // rev. 3
translate([cc_NEMA17_mount / 2, -cc_NEMA17_mount / 2, t_base])
cylinder(r = 3.5, h = z_bearing - 7); // rev. 3
if (t_feet > 0)
mounting_feet(thickness = t_feet); // make it 10 for a prusa top mount
}
translate([0, 0, (t_base > 3) ? z_bearing + t_base - 3 : z_bearing])
bearing_housing_relief();
// M3 screw holes
for(r=[1:4])
rotate([0, 0, r * 360 / 4])
translate([cc_NEMA17_mount / 2, cc_NEMA17_mount / 2, -1])
cylinder(r=1.75, h = 40);
translate([-cc_NEMA17_mount / 2, cc_NEMA17_mount / 2, 17.5])
cylinder(r = 3.3, h = 10); // rev. 3
translate([cc_NEMA17_mount / 2, cc_NEMA17_mount / 2, 1.5])
cylinder(r = 3.25, h = 4); // rev. 3
// relief for motor collar
translate([0, 0, -1])
cylinder(r = 12.5, h = 2.5);
}
}
module bearing_housing_body() {
difference() {
union() {
translate([-3, 0, 10.7])
cylinder(r1 = 4, r2 = 4, h = 8, center = true);
translate([0, 0, -9.8])
cylinder(r1 = 14.75, r2 = 6.3, h = 23.5); // rev. 3
}
for (i = [-1, 1])
rotate([0, 0, i * 30.5])
translate([8, 0, 3.2])
cube([15, 30, 27], center = true); // rev. 3
}
}
module bearing_housing_relief() {
difference() {
union() {
cylinder(r1 = 13, r2 = 5, h = 20, center = true);
translate([0, 0, 10.7])
cylinder(r=5, h = 5, center = true);
cylinder(r = 4, h = 27);
translate([0, 0, 13.2])
cylinder(r1=5, r2=4, h = 2, center = true);
translate([0, 0, 3])
cylinder(r = 7, h = 11.4, center = true);
translate([0, 0, 8.7])
cylinder(r1 = 7, r2 = 3.5, h = 3.5);
}
translate([1, -15, -5.45])
cube([30, 30, 30]);
}
}
//short_feed replaces the infeed tube opening with a conical opening suited for feeding short pieces of filament sequentially
module filament_path(
d_retainer,
h_retainer,
d_sheath,
d_filament,
offset_filament,
quick_release = false,
short_feed = false) {
difference() {
union() {
translate([offset_filament, 0, 13])
cube([8, 43, 26], center = true); //GCA
for (i = [(quick_release) ? 1 : -1, 1])
translate([offset_filament, i * 25, 10])
cube([d_retainer + 3, 9, 20], center = true); // GCA
// M3 nut retainers for preload idler screws
translate([3.3, 12.5, 13])
cube([11, 3, 26], center = true); // rev. 3
translate([3.3, 21, 13])
cube([11, 3, 26], center = true); // rev. 3
}
for (i = [-1, 1])
translate([offset_filament, i * 33, -5])
rotate([0, 90, 0])
cylinder(r = 12, h = 20, center = true); // GCA
union() {
// M3 bolt holes for preload idler
translate([3,17,20.5]) rotate([0,90,12]) cylinder(h = 12, r=2.75, $fn=25); // rev. 3
translate([3,17,9.5]) rotate([0,90,12]) cylinder(h = 12, r=2.75, $fn=25); // rev. 3
translate([-0.5,17,20.5]) rotate([0,90,0]) cylinder(10, r=2, $fn=25);
translate([-0.5,17,9.5]) rotate([0,90,0]) cylinder(10, r=2, $fn=25);
translate([0, 0, 3.3])
cylinder(r = d_gear / 2, h = 25);
// relief for idler - assume it crushes the filament only a small amount - originally 5.5
// the hobbed portion of the drive gear has a radius about 0.85mm smaller than the od of the gear
translate([od_608 / 2 + offset_filament, 0, 16])
cylinder(r = od_608 / 2, h = 18, center = true);
// filament path
translate([offset_filament, 0, 5.5 + z_bearing])
rotate([90,0,0])
cylinder(r = d_filament / 2, h = 60, $fn=25, center = true);
if (short_feed) {
translate([offset_filament, -4, 5.5 + z_bearing])
rotate([90, 0, 0])
hull() {
cylinder(r = d_filament / 2 - 0.1, h = 0.01);
translate([0, 0, 18])
cylinder(r = 1.5 * d_filament, h = 0.01);
}
}
else {
// cone opening at inlet to help guide filament into inlet filament path
translate([offset_filament, -21.75, 5.5 + z_bearing])
rotate([90,0,0])
cylinder(r1 = d_filament / 2, r2 = 1.6, h = 2, $fn=25);
// the infeed tube will be held in place by friction
translate([offset_filament, -10, 5.5 + z_bearing])
rotate([90, 0, 0]) {
// opening for expansion of end of tube
cylinder(r1 = d_filament / 2, r2 = d_sheath / 2 + 0.2, h = 3);
translate([0, 0, 3])
cylinder(r1 = d_sheath / 2 - 0.2, r2 = d_sheath / 2, h = 3);
translate([0, 0, 6])
cylinder(r = d_sheath / 2, h = 10);
}
}
if (quick_release) {
translate([offset_filament, 22, 5.5 + z_bearing])
rotate([-90, 0, 0]) {
metric_thread(diameter = d_quickrelease_threads, pitch = pitch_quickrelease_threads, length = l_quickrelease_threads + 1, internal = true, n_starts = 1);
translate([0, 0, l_quickrelease_threads])
cylinder(r = 4.5, h = 3);
}
}
else
// retainer nut slots
for (j = [-1, 1])
translate([offset_filament, j * 25.25, 5.5 + z_bearing])
rotate([90, 0, 0]) {
hull()
for(i = [0, 1])
translate([0, i * 10, 0])
rotate([0, 0, 30])
cylinder(r = d_retainer / 2, h = h_retainer, center = true, $fn = 6);
translate([0, 0, (j == 1) ? -6 : 0])
hull()
for (i = [0, 1])
translate([0, i * 10, 0])
cylinder(r = d_sheath / 2, h = 6, $fn=25);
}
// lop the top
translate([offset_filament, -6, 33])
cube([10, 34, 26], center = true); //GCA
}
}
}
module mounting_feet(thickness) {
difference() {
for (i = [-1, 1])
translate([-18.5 - thickness / 2, i * 26, 10])
cube([thickness, 22, 20], center = true);
union() {
// fixing plate cutout
translate([-20, 0, 12])
cube([6, 30, 18], center = true);
translate([-20, 34, 0])
rotate([45, 0, 0])
cube([30, 16, 7], center = true);
translate([-20, -34, 0])
rotate([135, 0, 0])
cube([30, 16, 7], center = true);
translate([-20, 34, 20])
rotate([135, 0, 0])
cube([30, 16, 7], center = true);
translate([-20, -34, 20])
rotate([45, 0, 0])
cube([30, 16, 7], center = true);
// mount holes
for (i = [-1, 1])
translate([-23, i * 30.5, 10])
rotate([0, 90, 0])
cylinder(r = 1.8, h = 30, center = true);
}
}
}
module idler_608z() {
translate([0,0,6]) rotate([0,90,0]) bearing(8, 22, 7);
extruder_idler_608z();
}
module support_strut() {
difference() {
union() {
translate([-15.5,0,0]) cylinder(6, r=5, $fn=30);
translate([15.5,0,0]) cylinder(6, r=5, $fn=30);
translate([-15.5,-3.5,0]) cube([31,7,6]);
}
union() {
// Screw holes
translate([-15.5,0,-1]) cylinder(5, r=1.75, $fn=30);
translate([15.5,0,-1]) cylinder(5, r=1.75, $fn=30);
translate([-15.5,0,3]) cylinder(5, r=3, $fn=30);
translate([15.5,0,3]) cylinder(5, r=3, $fn=30);
}
}
}