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Jhead resistor on a Makerbot Extruder board 3.6

Posted by davew_tx 
Jhead resistor on a Makerbot Extruder board 3.6
August 31, 2012 06:39PM
So, my hybrid machine has a jhead (1.75/.4mm) and i'm using a Makerbot 3.6 Extruder Controller.

I think that 3.6 board was developed for a cartridge heater, 12V 40W, that is large versus the compact brass hotend. (hotends.com!)

Does anyone know if the resistor for the Jhead can be used and not the cartridge heater?

makerbot say to use the cartridge, but I wonder if the board can be programmed or modified or used as is.

Also, I am going to use the thermocouple and not the included thermistor.
Any advice on the securing of the junction to the brass block?
There is a hole but it is large verus the thermocouple.
Should I tap a hole and trap the tc to an area under a washer?

Thanks!

Dave
Re: Jhead resistor on a Makerbot Extruder board 3.6
September 02, 2012 12:12AM
The cartridge heater is simply a fancy resistor. Since the J-Head resistor has a higher resistance than the MakerBot cartridge heater and will draw less current, it will work just fine.

Taping the thermocouple to the heater block with kapton would be just fine, just make sure to use several wraps to insulate it. Tapping a hole and bolting the thermocouple would be the ideal solution, but I'm not sure that it would make much of a difference.


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Re: Jhead resistor on a Makerbot Extruder board 3.6
September 02, 2012 08:26AM
perfect. thanks!smileys with beer
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