MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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I've gone through a couple of these arms made with PLA. After a week or so, I started getting under extrusion with each PLA printed arm. I found that the arm was no longer 90 degrees, but the spring had pushed the arm out to greater than 90 degrees. The bearing was no longer pressed against the gear and filament with the appropriate amount of force, so the extruder gear was slipping on the filament. I'm currently using this arm printed with ABS. Hopefully it will not bend after some use. Always print a spare first after installing a new arm!