The re-designed Rostock Mini Pro by 3D Printer Czar. This machine uses twelve Traxxas 5347 u-joints, six 3K carbon fiber arms, and a planetary gearbox extruder. If you don't fee like sourcing all the parts yourself, you can get it at only $459 with free worldwide shipping: http://3dprinterczar.com/shop/3dprinters/rostock-mini-pro/
The printer is under GPL license so feel free to edit and share. The SCAD files as well as the STLs can be found here. If you have some awesome ideas in mind please contact us and we might incorporate your designs in our future machine.