Add first steps for a cable driven 3D printer

printer.py

@@ -0,0 +1,95 @@
+#!/usr/bin/python
+
+from boxes import *
+
+class Printer(Boxes):
+
+    """Work in progress"""
+    def __init__(self, r=250, h=400, d_c=100):
+        Boxes.__init__(self, 1000, 800, thickness=5.0, burn=0.05)
+        self.r = r
+        self.h = h
+        self.d_c = d_c
+        # idler
+        self.D_i = 22.0
+        self.d_i = 8.0
+        self.w_i = 5.0 # includes washers
+
+
+    def mainPlate(self, nr):
+        r = self.r
+        if nr:
+            return
+        self.moveTo(r-5, r, -90)
+        self.hole(0, 0, r-80)
+
+        D_i2 = self.D_i / 2
+        w_i2 = self.w_i / 2
+
+        d_c2 = self.d_c/2
+        for i in range(6):
+            self.ctx.save()
+            self.moveTo(0, 0, i*60)
+            # winches
+            if i % 2:
+                self.fingerHolesAt(r-80, (d_c2+20), 70, angle=0)
+                self.fingerHolesAt(r-80, -(d_c2+20), 70, angle=0)
+            # idler buck
+            else:
+                d = 0.5*(self.thickness)+w_i2
+                for y in (-d-d_c2, d-d_c2, -d+d_c2, d+d_c2):
+                    self.fingerHolesAt(r-30, y, 30, angle=0)
+                self.hole(r-15+D_i2, -self.d_c/2, 0.4)
+                self.hole(r-15+D_i2, self.d_c/2, 0.4)
+            self.ctx.restore()
+
+
+    def head(self):
+        d_c = self.d_c
+
+        self.moveTo(self.spacing+10, self.spacing)
+        for i in range(3):
+            self.hole(0, 5, 0.3)
+            self.fingerHolesAt(25, 0, 25)
+            self.fingerHolesAt(75, 0, 25)
+            self.edge(d_c)
+            self.hole(0, 5, 0.3)
+            self.corner(120, 10)
+
+    def render(self):
+        self.ctx.save()
+        for i in range(3):
+            # motor mounts
+            self.rectangularWall(70, 70, edges="feee", callback=[
+                    lambda: self.NEMA(23, 35, 35),],
+                                 move="right")
+            # winch bucks
+            self.rectangularWall(70, 50, edges="feee", callback=[
+                    lambda: self.hole(35, 35, 8.5),], move="right")
+        self.ctx.restore()
+        self.moveTo(0, 90)
+        self.ctx.save()
+        # idler bucks
+        for i in range(12):
+            self.rectangularWall(30, 30, edges="feee", callback=[
+                    lambda: self.hole(15, 15, 3),], move="right")
+
+        for i in range(6):
+            def holes():
+                self.hole(3, 3, 1.5)
+                self.hole(8, 3, 1.5)
+            self.rectangularWall(25, 6, edges="feee", callback=[holes,],
+                                 move="right")
+        self.ctx.restore()
+        self.moveTo(0, 40)
+
+        self.rectangularWall(2*self.r-10, 2*self.r-10, edges="ffff",
+                             callback=self.mainPlate, move="right")
+                        
+        self.head()
+
+        self.ctx.stroke()
+        self.surface.finish()
+
+p = Printer()
+p.render()