After destroying several plastic belts in silly experiments, I needed a cheaper and quicker way of sourcing replacements. There's nothing cheaper and quicker than making your own with kapton tape and paper! I think it works even better than the plastic belts because of better adhesion and less surface warping. Works with the Cupcake's ABP V1.0 and on the Thing-O-Matic's ABP (although you quickly get wrinkles in the middle because of the roller gap)

1) Take a Makerbot supplied, ABP plastic parallelogram belt and lay it on a sheet of paper. A4 is enough for the Cupcake APB but something bigger is needed for the Thingomatic.

2) Mark the corners with a pen and connect the dots to create an outline.

3) Use 20mm wide kapton tape (or wider) to cover up the area within the outline.

4) Cut out the outline to make a parallelogram belt.

5) Proceed as you would with a Makerbot supplied, ABP parallelogram belt. ^^;