I’ve been trying to control the fan speed via M codes but have yet to find success. Even the on/off codes seem to do nothing. I believe the fan is on as long as the machine is on and that’s it. @CthulhuLabs explains it really nicely in this thread
http://forum.snapmaker.com/t/fan-is-always-on/1876
I’m hoping someone savy with electronics will find a way to hack in a fan controller and of course there is always the option of an external cooling source.
As far as material goes I’ve never tried ASA material so I can’t comment on it.