Lack Attachment Bracket (parametric)

Just a quick parametric remix of the lack attachment brackets from this thing:

https://www.thingiverse.com/thing:1843235

These brackets are customizable depending on the size of your glass. (For example, mine was 20"x20", so I needed a slightly different offset.

This will allow you to print brackets that have the correct offset calculated for just about any reasonable size of glass / magnet placement.

The available parameters are:
magnet_diameter,
magnet_height,
glass_thickness