About this 3D model

This an effector plate I've been using to attach various extruders, spindles and sensors on my Delta Parallel bot. Some examples: - http://www.thingiverse.com/thing:296799 - http://www.thingiverse.com/thing:292655 The distance between the delta arms is 60mm (it will not fit Kossel or Rostock without modifications). The center hole is 25mm dia (enough to slide fully assembled hot-ends through) and it has multiple hole patterns around it: - circular, 30mm dia: 12xM3 screws (every 30 degrees) - circular, 40mm dia: 6xM3 screws (every 60 degrees) - circular, 50mm dia: 6xM4 screws (every 60 degrees) - triangular (variable dia) with 6x12mm holes (for M6 screws) I cut them out of 6.35mm (1/4") thick aluminum, but 4mm could work just as well for 3D printing. I've cut some of acrylic, but of course it cracks easily.