Saturday, August 30, 2008

 

Crunchy Plastic?

I successfully extruded some ABS plastic today, but it was "crunchy"-- it was very brittle and actually crumbles in your hand.

Does anyone have ideas about what could be happening? Is this an indicator of too high or too low temperature?

Comments:
Way too high I would guess > 300C.

I only once got anything resembling crunchy when my thermistor fell off and the heater went full blast. Lots of smoke though was a bit of a give away.

Darker colour is also a sign of too hot.

Too cold just fails to bond with the previous layer, or if it way too cold fails to extrude as it is too viscous.

A good temperature to use for ABS is 230C.

I sometimes get crumbly filament when I change from one plastic to another until all the old stuff is flushed out.

Another cause could be a lot of moisture in it. Has it been stored in a damp environment?
 
Hi, thanks for the comments. I suspect of the options you listed, temp too high is most likely.

The filament i'm using is already black, so i cannot see the color.

Its been stored inside, so i think that's probably ok. i'll try a lower temp.
 
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