Elastico Pen Holder

Elastico Pen Holder for Prusa I3 (Aluminium carriage only?!).
I designed a model to handle a pen with elastic shock absorber. Normally the pressure on pen is soft .
The holes are 9,5 mm diameter, and to fit a tratto pen (like in photos and videos) i use a scotch tape, but finally i will use a permanent pen for PCB.
I use Repetier Host with slic3r, i set printer for "plotter use". I tried different solutions and i downloaded many programs, included malware (Argh..!!). But finally using a 3D stl model is possibile to handle by Repetier.
My final pourpose is to make a PCB ...
Nozzle/Pen = 0,15 mm
Layer Height = 0,15 mm
Lift Z = 0,5 mm

Test 1
https://www.youtube.com/watch?v=2FAHzPJgg5U

Test PCB
https://www.youtube.com/watch?v=8YDCF36-QnE

Final PCB
https://www.youtube.com/watch?v=Sum2vJyR8RM