Heatbed Thermistor Issue?
Hello,
I recently upgraded my MK4 that i've had for about a year now to the MK4S and have had a number of issues never seen the biggest one is preventing me from using my printer right now as i get a 26201 error. As the bed is heating no issues until it gets to about 75C. Then the readout on the LCD shows temperature bounding all over the place down 2C, up 6C, back to probably where it is. The hotter it gets, ie., into the 90C range for PETG the worse the error seems to get. I have followed the steps on the 26201 error and even taken a multimeter to the thermistor to confirm at high temperatures i do see the resistance fluctuating. 12.5k ohms then 12.3k ohms then 12.7k ohms even though the printer is off and naturally cooling. It should be steadily increasing in resistance as it cools but i've never seen a thermistor "fail" like this before.
Before i go order a $6 part and pay $40 shipping to Canada, want to know if anyone has seen this issue before? As i'm doing a real measurement with a multimeter i'm assuming the thermistor is failing?
RE: Heatbed Thermistor Issue?
have you checked the prices with Printed Soli?
they are US based and may have better delivery costs.
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Heatbed Thermistor Issue?
Thanks for the tip! Checked them out but they don't seem to ship to Canada (so much for being the 51st state haha)
RE: Heatbed Thermistor Issue?
Doh!
Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Heatbed Thermistor Issue?
Partsbuilt3D is US based (Ohio) and stocks many Prusa parts. I've bought an MK4S heatbed thermistor from them. Don't know whether they ship to Canada though.
RE: Heatbed Thermistor Issue?
These folks only ship to USA too!
Quick update. Did a bunch more testing this afternoon and determined its likely a damaged lead, likely when the MK4S upgrade was done withe the new wifi/heatbed cable went on it damaged one or both of the leads on the thermistor. Was able to reproduce the issue by moving the cable around when the heat bed was at high temp (which means the thermistor was at low resistance which would explain why only seen at high voltages).
So I did order a new thermistor (and an additional spare). In the mean time I spliced out the suspect wire and returned the printer to service. Yes it was spliced properly with solider and heat shrink.
Thanks everyone!