4xiDraw Drawing machine

My wife saw the new AxiDraw and wanted one.
http://shop.evilmadscientist.com/846
Unfortunately they will start shipping in June. So I had to do it myself during Easter holidays :-)

I am not yet done but progress is being made and as it seems to piece together nicely I think I can share it. AxiDraw is advertised as Open Source so I hope I am not stepping on anybodies toes here (if so let me know).

Please note that I have not yet mine up and running so I cannot make any claim about how well it works. We just saw the online video and were hooked.

My first mock-up is based on laser cut parts but my plan is to do a fully 3D printed version.

STEP source and STL files are provided. Please note some parts may need to be rotated to be printed without supports.
Or you can use the Onshape public document to do the same: https://cad.onshape.com/documents/236f46681d1cbe31f6d52db0/w/5948c0b4f86507971afed68c

And now it starts to move ... https://www.youtube.com/watch?v=_V3bHmOuxTI&feature=em-upload_owner with then new ends that hold the motors down instead of up.

And to draw: https://www.youtube.com/watch?v=xPq4ciNnNnw

#Update
New and improved pen holder and pen carriage and belt tensioner.

I have added a taller part for those with 48mm tall stepper motors too.

Building details and links to code can be found here http://www.instructables.com/id/4xiDraw/

You can have a 3D view of the complete system here http://a360.co/1N6b6tD

Zerginator user has created a FreeCAD model assembly and is kindly sharing it too: https://drive.google.com/file/d/0B0IYEtpw-9WNYWxpWlduVDdLMUk/view?usp=sharing

A new set of motor mounts is created for using a 40x20 aluminium extrusion instead of the threaded rods for a more sound built (newEnd40x20_1_.stl)