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
|
use <snapper.scad>;
extrusion_width=.5; layer_height=.2; // print parameters
epsilon=.005; // for finer cuts
heater_w = 16; // heatblock width
heater_l = 20; // heatblock length
nozzle_offset=4.5; // nozzle offset from the edge of heatblock
fanduct_elevation = 3; // fanduct elevation above nozzle tip
fanduct_h = 6; // inner height of the duct
fanduct_w = 6; // inner width of the duct
fanduct_shell=1.2; // shell thickness
fanduct_ir = sqrt(pow(heater_w/2,2)+pow(heater_l-nozzle_offset,2))+5; // inner radius
jet_angle = 60; // angular width of the jet
inlet_w = 12.5; // inlet width
inlet_h = 17; // inlet height
inlet_l = 7; // inlet length of protrusion (or depth of intrusion:))
inlet_away = 15; // how far away inlet is
hotend_clearance = 12;
snapper_d = 8; snapper_overlap=0.2; // snip snap
smooth_f = 120;
type="3jets"; // "3jets" ; // circular|3jets
module fanduct(type=type) {
// *** duct is all around!
module duct(what) {
if(what=="in") {
sh = fanduct_w+2*fanduct_shell; sv = fanduct_h+2*fanduct_shell;
smax = max(sh,sv);
rotate_extrude($fn=smooth_f)
translate([sh/2+fanduct_ir,sv/2])
scale([sh/smax,sv/smax])
circle(d=smax,$fn=4*smax);
}else if(what=="out") {
sh = fanduct_w; sv = fanduct_h;
smax = max(sh,sv);
rotate_extrude($fn=smooth_f)
translate([sh/2+fanduct_shell+fanduct_ir,sv/2+fanduct_shell])
scale([sh/smax,sv/smax])
circle(d=smax,$fn=4*smax);
}
}
// *** bumps for easier position adjustments in line with hotend
module marks(what) {
if(what=="in") {
for(y=[-1,1])
hull() for(z=[0,-fanduct_shell-fanduct_h/2])
translate([0,y*(fanduct_ir+fanduct_shell+fanduct_w/2),fanduct_shell*2+fanduct_h+z])
rotate([90,0,0]) {
cylinder(r=fanduct_shell,h=fanduct_w,center=true,$fn=30);
for(z=[-1,1]) translate([0,0,z*fanduct_w/2])
sphere(r=fanduct_shell,$fn=30);
}
}
}
// *** output
module output(what,type=type) {
module guideline(xyxy) {
module pin(xy) {
translate([xy[0],xy[1],0])
cylinder(d=2*extrusion_width,h=2*fanduct_shell+inlet_h,$fn=6);
}
xyxyxy=concat(xyxy,[[0,0]]);
for(i=[0:1:len(xyxyxy)-2])
hull() for(j=[i,i+1]) pin(xyxyxy[j]);
}
module circus(what) {
if(what=="in") {
difference() {
rotate_extrude($fn=smooth_f)
polygon([
[0,-fanduct_elevation],
[fanduct_ir+fanduct_shell,fanduct_shell+fanduct_h/2],
[fanduct_ir+fanduct_shell+fanduct_w/2,0],
[0,-fanduct_elevation-.1]]);
translate([0,0,-1])
cylinder(r=hotend_clearance,h=fanduct_h+2*fanduct_shell+2,$fn=smooth_f);
mirror([0,0,1])
translate([0,0,-epsilon])
cylinder(r=fanduct_ir+fanduct_shell+1,h=fanduct_elevation+.1+2);
}
}else if(what=="out") {
difference() {
rotate_extrude($fn=smooth_f)
polygon([
[0,-fanduct_elevation],
[fanduct_ir+fanduct_shell+1,fanduct_h/2],
[fanduct_ir+fanduct_w/2+fanduct_shell+1,fanduct_shell],
[0,-fanduct_elevation-.1]]);
circus("airguides");
}
}else if(what=="airguides") {
inr = fanduct_ir+fanduct_shell; our = inr+fanduct_w;
union() {
for(my=[0,1]) mirror([0,my,0]) {
guideline([
[-our,inlet_w/6],
[-inr*sin(60),inr*cos(60)]
]);
a0=30; as=15; a1=180;
for(a=[a0+as:as:a1]) {
f = as/(a1-a+as);
rotate([0,0,a]) guideline([[-inr-fanduct_w*f,0]]);
}
guideline([
[-our+fanduct_w*cos(30)*3/4,fanduct_w*sin(30)*3/4],
[-inr*cos(10),inr*sin(10)]
]);
}
}/*union*/
}/*airguides*/
}
module jets(what) {
od = fanduct_h/2+fanduct_shell;
md = fanduct_ir+fanduct_shell+fanduct_w/2;
jww = 2*md*sin(jet_angle/2);
render(convexity=8) difference() {
for(a=[0:120:359]) rotate([0,0,a]) {
if(what=="in") {
hull() {
render(convexity=4) intersection() {
translate([md-fanduct_shell-fanduct_w/2,-jww/2,0])
cube(size=[fanduct_shell+fanduct_w/2,jww,od]);
duct(what=what);
}
translate([0,0,-fanduct_elevation]) sphere(r=.5);
}
}else if(what=="out") {
hull() {
render(convexity=4) intersection() {
translate([md-fanduct_w/2-fanduct_shell,-jww/2+fanduct_shell,fanduct_shell])
cube(size=[fanduct_w/2+fanduct_shell,jww-2*fanduct_shell,od-2*fanduct_shell]);
duct(what=what);
}
translate([0,0,-fanduct_elevation]) sphere(r=.2);
}
}
}
if(what=="in") {
translate([0,0,-fanduct_elevation-2+epsilon])
cylinder(r=fanduct_ir+fanduct_shell*2+fanduct_w+1,h=fanduct_elevation+2);
translate([0,0,-hotend_clearance])
rotate([0,0,30])
cylinder(r1=hotend_clearance*2,r2=0,h=hotend_clearance*2,$fn=6);
}
}
}
if(type=="circular") circus(what);
else if(type=="3jets") jets(what);
}
// *** air intake
module intake(what) {
module placeit() {
translate([-fanduct_ir-2*fanduct_shell-fanduct_w-inlet_away,0,fanduct_shell])
rotate([0,-90,0])
children();
}
if(what=="in") {
placeit() translate([0,-inlet_w/2,0]) {
cube(size=[inlet_h,inlet_w,inlet_l+fanduct_shell]);
// supports
for(i=[-1,0,1])
translate([-fanduct_shell,
(i+1)*(inlet_w-extrusion_width)/2,
-inlet_away-fanduct_w/2])
cube(size=[fanduct_shell,
extrusion_width,
inlet_l+fanduct_shell+inlet_away+fanduct_w/2]);
}
hull() {
placeit() translate([-fanduct_shell,-inlet_w/2-fanduct_shell,0])
cube(size=[inlet_h+2*fanduct_shell,inlet_w+2*fanduct_shell,fanduct_shell]);
translate([-fanduct_ir-fanduct_shell-fanduct_w/2,0,0])
translate([0,-inlet_w/2-fanduct_shell/2,0])
cube(size=[1,inlet_w+fanduct_shell,fanduct_shell*2+fanduct_h]);
}
}else if(what=="out") {
placeit() translate([fanduct_shell,-inlet_w/2+fanduct_shell,0])
cube(size=[inlet_h-2*fanduct_shell,inlet_w-2*fanduct_shell,inlet_l+fanduct_shell+1]);
hull() {
placeit() translate([fanduct_shell,-inlet_w/2+fanduct_shell,0])
cube(size=[inlet_h-2*fanduct_shell,inlet_w-2*fanduct_shell,fanduct_shell]);
translate([-fanduct_ir-fanduct_shell-fanduct_w/2,0,fanduct_shell])
translate([0,-inlet_w/2,0])
cube(size=[1,inlet_w,fanduct_h]);
}
}
}
// *** DUCT TAILS!!! WOO-OO! (every day they're out there making duct tails…)
module tails(what) {
if(what=="in") {
for(mx=[0,1]) mirror([mx,0,0])
translate([fanduct_ir+fanduct_shell+fanduct_w/2,0,fanduct_shell+fanduct_h/2])
rotate([90,0,90])
translate([0,0,-snapper_d/2])
snapper(d=snapper_d,o=snapper_overlap,side=0,l=fanduct_h*3/2+fanduct_shell);
}
}
module parts(what) {
union() {
duct(what);
marks(what);
output(what);
intake(what);
tails(what);
}
}
difference() {
parts("in");
parts("out");
}
}
view="full"; // hcut|vcut|*
hinfinity=4*(fanduct_ir+fanduct_shell*2+fanduct_w+inlet_away);
vinfinity=2*(fanduct_shell*2+fanduct_h+inlet_h);
if(view=="hcut") {
difference() {
fanduct();
translate([-hinfinity/2,-hinfinity/2,fanduct_shell+fanduct_h/2])
cube(size=[hinfinity,hinfinity,vinfinity]);
}
}else if(view=="vcut") {
difference() {
fanduct();
translate([-hinfinity/2,0,-vinfinity/2])
cube(size=[hinfinity,hinfinity,vinfinity]);
}
}else fanduct();
/* vim:set sw=1 ai: */
|
