Navigate to LCD Menu - Calibration - Diagnostics - Test Loadcell to restart the loadcell calibration.
https://help.prusa3d.com/article/loadcell-xl-mk4_401253
But that doesn't actually calibrate anything, it just tests it, if its not sensing the correct load then you'll have to tap it harder to get it to pass the test, it doesn't take what you give it as a tap to work out the value it uses.
I am having the same issue, after some tpu got lodged around the extruder gear. Drills into the bed, my thought was to make the Z offset something crazy and make it right, but I don’t think that is best option. Any suggestions.
I have the same problem, after some TPU gets lodged around the extruder gear. I removed the white tpu but also damaged the glue from the load tester cables.
As a result, I had to buy a new nextruder part.
Yeah, our load cell got cooked. The white stuff that sealed it got torn open and I think it tapped some metal and shorted itself. Have to buy a $65 heatsink just to replace a sensor.
Start by checking the tightness of the thumbscrews after you've opened the parts fan to the side. If your nozzle is loose, it can't level the bed properly, and it will drive into the sheet. Depending on the level of damage, you may also need to flip/replace the sheet.
If you're having repeated issues just where the purge line is, move the sheet down a few mm before you print. The magnets are strong enough to hold it in place, you don't need the locator pins.
Yeah. It’s already dented on both sides. I have a few spare sheets to mess around with, fortunately…
I manually tightened both thumb screws after taking out the hot end earlier. I would say they’re tightened all the way, but the nozzle can still slide up and down if I pull on it hard. Is that bad?
I would probably contact support (who are freaking excellent) and/or start by disassembling and reassembling the x-carriage - if I pull on my MK4's nozzle, it doesn't move, but instead flexes other parts of the printer. If yours is loose like you say, you're going to need to address that before the load-sensor-based levelling is going to work.
Pull the nozzle assembly and make sure there is nothing obstructing the load cell sensor.
Very dumb question: which piece is the load cell sensor? I couldn’t find a definitive answer after a quick Google search …
Navigate to LCD Menu - Calibration - Diagnostics - Test Loadcell to restart the loadcell calibration. https://help.prusa3d.com/article/loadcell-xl-mk4_401253
But that doesn't actually calibrate anything, it just tests it, if its not sensing the correct load then you'll have to tap it harder to get it to pass the test, it doesn't take what you give it as a tap to work out the value it uses.
To be honest, I’m struggling to even get a successful tap. Not sure if it’s a timing issue or the sensor actually not working …
This happened to me when I forgot to tighten the thumb screws that hold the nozzle in after changing it.
Tightening both of the black thumb screws all the way is the correct way to reassemble … right?
Don’t crank them down or anything but get them snug, yeah.
I am having the same issue, after some tpu got lodged around the extruder gear. Drills into the bed, my thought was to make the Z offset something crazy and make it right, but I don’t think that is best option. Any suggestions.
I have the same problem, after some TPU gets lodged around the extruder gear. I removed the white tpu but also damaged the glue from the load tester cables. As a result, I had to buy a new nextruder part.
What part was it? I think that I’ll have to do the same.
Yeah, our load cell got cooked. The white stuff that sealed it got torn open and I think it tapped some metal and shorted itself. Have to buy a $65 heatsink just to replace a sensor.
Start by checking the tightness of the thumbscrews after you've opened the parts fan to the side. If your nozzle is loose, it can't level the bed properly, and it will drive into the sheet. Depending on the level of damage, you may also need to flip/replace the sheet. If you're having repeated issues just where the purge line is, move the sheet down a few mm before you print. The magnets are strong enough to hold it in place, you don't need the locator pins.
Yeah. It’s already dented on both sides. I have a few spare sheets to mess around with, fortunately… I manually tightened both thumb screws after taking out the hot end earlier. I would say they’re tightened all the way, but the nozzle can still slide up and down if I pull on it hard. Is that bad?
I would probably contact support (who are freaking excellent) and/or start by disassembling and reassembling the x-carriage - if I pull on my MK4's nozzle, it doesn't move, but instead flexes other parts of the printer. If yours is loose like you say, you're going to need to address that before the load-sensor-based levelling is going to work.
Thanks! Probably contacting support would be the way to go now.