This forearm is designed to slip over the existing forearm and be temporarily stuck on using a drop or two of rubber cement or other easy to remove sticky ...

You can find a bunch of 1mm thick aluminum/alloy part files I've created in the 3D Content Central Library online ... it's FREE!
3dcontentcentral.com/Search.aspx?arg=wperko

These files are importable to the Microsoft Robotics Studio ... another FREE PC software tool ...

Sorry, I don't know the strengths of the MakerBot printing materials, nor the tolerances needed in design ... hence I need a MakerBot to learn and adjust my sketches to conform properly ...

Okay, for those not clever enough to make large overhangs ... I added the flat version for MakerBoting. I should note that sketch orientation of designs is -90° out of whack from SolidWorks to the MakerBot files.

This is another of many entries to the makezine.com/go/makerbot contest ...

blog.makezine.com/archive/2010/04/makerbot_giveaway.html