Parametric Bushing generated using Cadmium

parametric-bushing.py

#!/usr/bin/python
#
# Parametric bushing
# derived from OpenSCAD script from http://www.thingiverse.com/thing:8697
# 

from math import *
from cadmium import *

def generate(height, radius, hole_r, border, recess, num_support):
  outer_rings = (
    Cylinder(r=radius+border, h=1) +
    Cylinder(h=2, r1=radius+border, r2=radius).translate(0,0,1) +
    Cylinder(h=height-6, r=radius).translate(0,0,3) +
    Cylinder(h=3, r1=radius, r2=radius-border).translate(0,0,height-3)
  ) - Cylinder(r=radius-(border*2), h=height+border).translate(0,0,-1)

  shafts = None
  for i in range(num_support):
    b = Box((radius-border)*2-0.6, border*2, height) \
          .translate(-radius+border+0.4,-border,0) \
          .rotate(Z_axis,i*180/num_support)
    if shafts:
      shafts += b
    else:
      shafts = b
  central_ring = Cylinder(r=hole_r+border*2, h=height)

  central_hole = Cylinder(r=hole_r,h=height+2)
  recess = Cylinder(r=radius-2*border, h=recess)

  return (outer_rings + shafts + central_ring) - \
    (central_hole + recess).translate(0,0,-1)

generate(16, 75.0/2, 4.5, 1.56,5,3).toSTL('bushing.stl')