Marking gauge - Adjustable and fixed width

[V2 is out!](http://www.thingiverse.com/thing:2312582) and its better.

This is a simple marking gauge. It features two holes for marking beams. By printing two of the single pin marking beams you can use this as an adjustable marking gauge or a cutting gauge.

The fixed width marking beams are for marking mortise and tenons that are 6mm, 12mm, 20mm or 24mm in width. Of course you can use the two single pin marking beams to mark out mortise and tenons of any width.

This design uses tw