- May 26, 2016 at 8:57 am #12917
I have milling working great on my MPCNC. Now I’m trying to get the 3d printing working.
– I have both sides of the ramps board powered via a jumper as in the instructions
– I have the extruder nema stepper fan wired into the main green power ports
– I removed the 100ohm resistor and plugged the thermistor from the 3d extruder (same model as sold here) into T0
– I have the extruder fan plugged into D8
– I have the hot end plugged into D10
– I have B16_32_fullG-112515 flashed
When I power up the board (not connected to PC) it reports “Error: MAXTEMP” on the LCD. Same happens when I connect to computer via USB.
I then tried the Marlin_16_32_090615_therm firmware and it then reports “Error: MINTEMP”.
Shouldn’t this be displaying the room temp of the thermistor? Any ideas on what I am doing wrong?May 26, 2016 at 2:44 pm #12936
Sounds like whatever hot end you got has a different value thermistor. I’m not sure how to verify that. Check to see if you actually do show a value of resistance. The little wires are delicate and easily come disconnected.May 26, 2016 at 4:39 pm #12946
It is a 3950, 100k ohm type thermistor (http://www.ebay.com/itm/271890531456), not sure why I didn’t just buy it from you. It looks like from the config it is set as the right type to load the right temp tables.
My multi-meter is acting weird and isn’t correctly reading resistance on the thermistor (or the spare one I have from the heat bed you linked to in your new 3d printer design or just any random resistor I have). I will pickup a new one tomorrow and verify that.
Thank you for such an incredible project. Have really had a lot of fun with this and appreciate all of the time you have put into this project!May 26, 2016 at 5:28 pm #12947
Okay, so I tried out the thermistor from the heatbed (just connected to pins) and no error. I then noticed your setup for these imported extruders. I took mine apart as you document and I think the thermistor just had loose wires as you described. After I connected it all backup it worked great and is printing great! Thank you!
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