UP temp mod lid

by 3Dprintergear, published

UP temp mod lid by 3Dprintergear Aug 23, 2012
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This is a lid to house the switch and harness for my low extruder temp mod for the UP printer.


I've used a 13ohm resistor inline with the termperature probe, to trick the printer into thinking the temperature is higher than it actually is. I found 13 ohms drops the extruder temp to around 240 C. ( I found this a good compromise for most colours) Although it still shows 270 in software. The addition of a switch allows quick and easy changes from OEM to aftermarket filament.
The plugs are JST-XT.

Update - I now recommend using a 10 ohm 1 watt resistor as the 13 ohm can drop the temperature a little too far when printing with Taulmans nylon. The 10 ohm will give around 250-255 C.

I also now offer the patch lead for those who don't want to, or can't make their own. http://www.3dprintergear.com.au/UP_low_temp_filament_mod_p/templead.htm

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Thanks for the advice!

Can you tell me how many watts the resistor should be rated?

I tried with a small 1/4Watts and the resistor immediatly died in a grey smoke :o/

Are you sure you're wiring yours correctly? I think you might have wired yours through the heater wires.
I'm using 1/4 watt and that is running fine.

It should only be the signal from a temperature sensor that is going through those two wires - not much current at all.

Check out my pic and the disclaimer ;)

UP temp mod lid
by Dogbert

Hi Dogbert,

Actually I am using 1/4 watt resistors. Also I note other suppliers are using the same wire, so either they blatantly copied me ( which I suspect) or they found that to be the correct wire.

I think the 4 wires correspond to + and - for the heater and sensor. So I think you just have it on the other line, but still the sensor.

I think the ones I use are 1 watt.

Good tip on remembering to switch back. I've done similar and wondered why things weren't printing.....

Nice one Jamie! Ha - you beat me to it! I was going to design one myself. I have had my mod cable-tied precariously to the top for a while.
I'll print one soon! :-)

One little hint with the mod - make sure you have the two wires to the switch and the resistor in parralel. I've found if you accidentally leave the temp on the high setting during a print, you can switch down without it getting the grumbles.