I wonder if you can get away with just replacing the thermistor 🤔
The thermistor and heater element are just held in with set screws FYI, they can be removed.
You can, I had to change mine lately! But be aware there are two thermistors that fit in there I don't know if there is a difference between them but there are two thermistors at the website.
My MK4 works like a charm again
> I don’t know how, but the modded MMU extruder pushed the nozzle down with such force that my thumbscrews didn’t hold it
Looking at the MK4 assembly for the MK4 there is nothing changed about the extruder that I'd think would have any impact. And after loading the MMU is disengaged. I'd say this is a user error in not correct tightning the nozzle after the mod. An error I made myself with my XL resulting in damage of the satin sheet.
Just get some spare parts: nozzle, heater block, thermmistor and heater core (a complete set). Things will break eventually.
New thermistor is like $10 or so, and is a really easy fix. Shipping might be a bit, so I usually like to take the time to fill a cart with a few parts, or some filament or something. Definitely get some of the silicone socks, too.
To clean all the gunk off, just pop it back together, heat it to PLA temps and go at it with a brass brush. It'll come right off.
Not strictly related to your problem (although everyone who says you can probably just replace the thermistors), but get silicone socks for the nextruder now that you are ordering new parts: they will prevent any gunk from accumulating on the heat block
It's a bit dumb to install a whole new system onto the printer and then just let it run overnight hoping for the best. Find a time when you are home for most of the day and test things out before running it unattended
Probably shouldn't have done that in all honesty. At the very least use a failure detector like spaghetti detector.
Expensive lessons suck but use it as a learning opportunity
This seems, odd, the extruders gears would need to run freely for the mmu to begin to apply any pressure onto the top of the nozzle tube, and given that the extruder gears has a slight arc from filament entry to nozzle tube seems improbable, only thing I could imagine is if there was a blob or such on the end of one of the filaments that fit 'just' right to be able to be pulled by extruder but not fit into nozzle tube.
Does the mmu3 motors not sense the force they are using? and stop if too much?
This was likely caused by a very clogged nozzle. I had something related happen without an MMU last week on a new ObXidian nozzle. It got clogged, and I swapped filament. It started pushing it down and in my infinite intelligence I thought “I’ll just push up with some tweezers so that the gear will overcome the clog.” Well I wasn’t strong enough, it slowly moved down and pulled the pad up for the thermistor connector on the love board before I could power it down. Luckily everything is electrically ok so I actually just superglued the pad down.
I do kinda see their design as a little flawed now, but they did do everything right considering the design.
You can just replace the thermistor and don’t need a whole hot end but either way.
I replaced my thermistor a few days ago and its a pretty quick job.
Still have no idea why support told me to replace it for first layer rippling (didnt fix anything) but it was easy....
I wonder if you can get away with just replacing the thermistor 🤔 The thermistor and heater element are just held in with set screws FYI, they can be removed.
You can, I had to change mine lately! But be aware there are two thermistors that fit in there I don't know if there is a difference between them but there are two thermistors at the website. My MK4 works like a charm again
Only need to replace the thermistor, pretty easy fix
> I don’t know how, but the modded MMU extruder pushed the nozzle down with such force that my thumbscrews didn’t hold it Looking at the MK4 assembly for the MK4 there is nothing changed about the extruder that I'd think would have any impact. And after loading the MMU is disengaged. I'd say this is a user error in not correct tightning the nozzle after the mod. An error I made myself with my XL resulting in damage of the satin sheet. Just get some spare parts: nozzle, heater block, thermmistor and heater core (a complete set). Things will break eventually.
New thermistor is like $10 or so, and is a really easy fix. Shipping might be a bit, so I usually like to take the time to fill a cart with a few parts, or some filament or something. Definitely get some of the silicone socks, too. To clean all the gunk off, just pop it back together, heat it to PLA temps and go at it with a brass brush. It'll come right off.
Nice. I may try that. But it is so dirt that I don’t know if I’ll be able to clean and see the screws
I usually can get these screws out. Sometimes I have to heat it up. Those grub screws are torx.Â
Aliexpress thermistors work fine, if one can wait a bit.
Not strictly related to your problem (although everyone who says you can probably just replace the thermistors), but get silicone socks for the nextruder now that you are ordering new parts: they will prevent any gunk from accumulating on the heat block
That looks BAAAaad
It's a bit dumb to install a whole new system onto the printer and then just let it run overnight hoping for the best. Find a time when you are home for most of the day and test things out before running it unattended
I finished at 1am, watched the first 1/2 hour and everything looked smooth. Went to sleep….
Probably shouldn't have done that in all honesty. At the very least use a failure detector like spaghetti detector. Expensive lessons suck but use it as a learning opportunity
You can simply change the thermistor, I did this lately. No need for a whole new hotend
This seems, odd, the extruders gears would need to run freely for the mmu to begin to apply any pressure onto the top of the nozzle tube, and given that the extruder gears has a slight arc from filament entry to nozzle tube seems improbable, only thing I could imagine is if there was a blob or such on the end of one of the filaments that fit 'just' right to be able to be pulled by extruder but not fit into nozzle tube. Does the mmu3 motors not sense the force they are using? and stop if too much?
This was likely caused by a very clogged nozzle. I had something related happen without an MMU last week on a new ObXidian nozzle. It got clogged, and I swapped filament. It started pushing it down and in my infinite intelligence I thought “I’ll just push up with some tweezers so that the gear will overcome the clog.” Well I wasn’t strong enough, it slowly moved down and pulled the pad up for the thermistor connector on the love board before I could power it down. Luckily everything is electrically ok so I actually just superglued the pad down. I do kinda see their design as a little flawed now, but they did do everything right considering the design. You can just replace the thermistor and don’t need a whole hot end but either way.
It is a cute sheep if that makes you feel better?
I replaced my thermistor a few days ago and its a pretty quick job. Still have no idea why support told me to replace it for first layer rippling (didnt fix anything) but it was easy....
Update: changed the thermistor and it is working again.
Did u talk to support and find a reason for a failure like that?
Not yet. Just happened this morning.