Enlarged Rostock Carriage V1.0 for 12mm smooth rod & KB-12-WW bearings

DEPRECIATED: Replaced by http://www.thingiverse.com/thing:79147

I'm not convinced this is the best implementation but I want do build it rapidly so I went for limited change on the carriage.

Once the printer will be working I will try to spend some time on it to review the branch attachment to limit potential mouvments due to play in the bearings:

• Allignment of links to the center planes of the bearings booth vertically & horisontally
• Alignement of the belt mount to the center between the bearings
• M3 Screw based Bearing housings