Orca V0.30 open Frame X carriage LM8UU

outdated design !, i recommend to print the uni-X Carrier instead http://www.thingiverse.com/thing:25420

i was sick of the removing procedure every time so i made my x carriage open.

Changes are:

• Open frame
• Baseplate about 2,3mm smaller, now 30mm Screws fit better
• moved the right outer hole 10mm forward
• made some additional hexagon countersunk