Sunhokey Pen holder

I came across this pen holder http://www.thingiverse.com/thing:671711.

When i saw it, I had to make this for my own 3d printer (sunhokey i3 2015) and so i did :-)
Somehow the stl files get rotated wrongly when uploaded to thingiverse. So be sure to rotate it logically in your slicer.
This holder is made for markers with a diameter of 16mm, but with the 10mm ring you can fit 10mm markers or pens.

This is how it should work:
https://youtu.be/ByMo5hVcP5I

Here is the first test run: htt