This design is based on http://www.thingiverse.com/thing:705345 This set has a left and a right arm which is different from thing 705345 for the M3D printer.

I had printed a set from 705345 and it worked well, but during every print had problems with the filament reel riding up the flat section of the Left Foot and causing the head to Click, probably from the added friction of the reel rubbing on the foot. I am including just the two arms, you will need to grab the spindle from the other design page.

Enjoy..

(update 4.1.15) added a new STL file for getting both arms onto the bed of the M3D, I checked this for fit on the M3D but have not tried it.

(update 6.2.15) Marmoset printed the version with both arms on the same bed, came out nice. http://www.thingiverse.com/make:140313