Good points gaerek, but I believe the significant difference in temperatures is a much greater risk, as the therms (BTU's) are also there with enough rounds (ala an M2 barrel will melt and droop with enough continuous firing). My guess is it will take significantly fewer rounds to affect the ABS barrel.
In reactionary governments
it might result in new legislation outlawing 3D printing. In other it may result in more ineffective and misguided laws.