Thursday, August 04, 2011

 

Hot Plastic


Hot plastic. My extruder was running on the hot side, Nophead suggested this was due to the difference between the internal and external temperatures and he was spot on. Whilst I had originally constructed my Thermistor lookup table using a temperature probe clipped to the outside of the nozzle the inside was running a good 40 to 50 Deg C hotter. The problem is fixed now and a new thermistor table is in place all with the help of an Arduino based tool to help the process along.

Comments:
The actual temperature difference was probably quite a lot less but if you just press a thermocouple against a hot surface I have found it reads low. It either needs to be embedded into the heater or you have to cover the exposed side with a good insulator such as ceramic cloth.
 
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