Minimal arduino mega2560 / ramps 1.4 holder

This is a very minimalistic holder for an arduino mega 2560 board with or without a ramps or other shield on top.

There are two versions available
- one that uses melt nuts size m3x4x4. ( http://www.banggood.com/100pcs-M34mm-H62-Brass-Knurl-Nuts-DIY-Accessories-p-971077.html ) Very useful things. Melt with a soldering iron in the plasic.
- one with smaller holes where a m3 can be screwed in directly (untested)

This can be mounted on a frame or so. If needed drill more holes in it to ho