Heatsinks

[DrLuigi]

Hey guys,

I've seen some heatsinks on Thingiverse lately, That makes me think if PLA/ABS is a good heat conductor?
As my Stepper motors get realy hot (Y is quiet hot) To perhaps make a heatsink in ABS and do some thermalpaste on it and try to stick it on the motor?

But i first wanted to know if this was legit, or pretty useless.

Thanks!