The SmartrapCore printer by Smartfriendz is a great 3D printer! :)
I've got the wooden box version with 6mm axis, and it works really fine.
Latest improvements are amazing, specially the pulleys around 608ZZ bearings and the way X axis can be installed and uninstalled on the Yslide parts without having to disassemble all the XY core parts. I wanted to print these improvements for my printer, but it seems all the new designs are made for 8mm axis.
So, I decided to re-design the whole thing for my 6mm setup, and while I was on it, I made several adjustments of my own, including, of course putting bunny heads on every little piece. :)
This is only the XYcore part. It's designed to work fine with my other printer elements like the new slideX with radial fan (http://www.thingiverse.com/thing:1190481), the geared extruder (http://www.thingiverse.com/thing:1359717), cable and filament holder (http://www.thingiverse.com/thing:755862) and spool holder (http://www.thingiverse.com/thing:1023607), to say the least… :)