We saw the 254 gearboxes in 2007 and were like: "ABS! Of course! Why didn't we think of that!?"
We bought some .25" ABS scraps at Tap for 50 cents each and used them in the trannies.
Had we thought to ask 254 about their robot we may have discovered that they were actually using delrin which is about .4 g/cm^3 denser.
