parametric bearing mount

This is a fully parametric (openScad) linear bearing mount.

Features:
- variable dimensions for the bearing (LM8UU, LM8LUU, LM10UU, ...)
- 1 or 2 zipties fix the bearing (variable distance and dimensions)
- 2 or 4 screw-holes (optinal slotted; variable distance and dimensions)
- variable height-offset of the bearing

I am using them (the example-stl) with Igus-LM10UU Bearings with a 6.5mm Z-offset at the Y-axis (dimensions see .scad-file).