[Breadbocks]

I suspect if you could get it to print right with the proper spacing, ABS would have enough flex without being too squishy or too rigid. The trick is getting it right.

As far as spacing, the only actual problem is length, which chain stretch contributes to. The three options are 1. ignore it, 2. tension it, 3. have some way to move a sprocket around so you can move it back when chain stretch.