ready to print chain mod

This is a remix of the awesome tracks https://www.thingiverse.com/thing:2393975/ for Bryant87's RC Speed Tank. http://www.thingiverse.com/thing:2024364

I simply laid out 44 chains and 88 grooves on a single platter, because most slicers don't pack very efficiently.

Update: after some testing, I found 2 problems:
- the chain is fairly weak (printed in ABS)
- the inserts, which I printed in flexpla, dont stick very well, even when glued with epoxy

So I made a modified version, which I have not tested yet! but which is thicker (stronger) and rather than relying on 3 pins to hold the inserts, I carved them out. Bonus effect: even without inserts, you get some grooves. Due to the increased thickness, there might be a tiny effect on the chain length, but I dont know yet if thats a problem.

I will upload an array of this design once I did a few test prints.