Fast-clamp pen holder for k8200/3drag

Why a pen holder for 3Drag?
I found it very usefull before engraving, to test Gcode.

Engraving supports for 3Drag/K8200:
- using Valex drill ;http://www.thingiverse.com/thing:951383
- using Dremel drill: http://www.thingiverse.com/thing:225465
- using Parkside drill: http://www.thingiverse.com/thing:768599

Complete collection of Add-on for 3Drag/K8200 using Fast Clamp: http://www.thingiverse.com/sillano/collections/3drag-fast-clamp-addon