Parametric Mount for Berd Air MAX

Here's a simple OpenSCAD-based mount for the large motor used in the [Berd-Air MAX system](http://www.themakerhive.com/shop/viewitem.php?productid=45). As opposed to the mount published by MakerHive, which seems to be optimized for aluminum extrusion-based frames, this mount is intended for Prusa i3-style or boxy CoreXY printers with frames built out of flat materials.

The motor is held in place with a strip of double-sided velcro (a few zip-ties are too puny to handle this gigantic motor), which is threaded through the channel in the mount. The mount itself is attached to the frame with friction and a screw (I drilled a hole into the frame using the mount itself as a guide).

The default settings are for a 1/4" frame, Velcro-brand velcro and an M3 screw, but everything can be adjusted according to whatever is on hand. If you have a printer that is tough to drill into (or you don't want to void warranties), just decrease your measured board thickness by about 0.5 mm to get a tigh