RE: Core One crash/restart
I have bonded and grounded EVERYTHING and had one crash after. I installed a Transient Voltage Spike diode (33v) across the 24v input to the board from the power supply and so far so good. No crashes yet.
RE:
I would like to investigate a little more deeply into this issue: I too experienced the crash / restart issue and indeed cured it by grounding the x/y motors. We can assume from this that the problem is electrical in nature. That much is clear. What is not clear is whether people are having this problem with pre-assembled or kit printers. If the issue is with both variants then it lies clearly lies with Prusa to investigate and rectify. If however the issue is with kit assemblies then that is a different scenario which is not entirely within the control of Prusa - Assuming that it is a problem with kits (purely for the sake of continuing these thoughts) then we should look at what each of us have done differently. I religiously followed the assembly instructions except for one tiny detail. In my case I did not align the axis belt pulleys correctly and as a result one on the belts, unbeknownst to me, was rubbing on the frame. That is a recipe for the generation of static and the subsequent electrical spikes which we assume are the cause of the crash / restart. It sounds very logical to me but what I cannot be sure of is whether the belt rubbing really was the founding cause of the issue. If you simply state that you have had this issue and that you cured it by doing 'xyz'; then it doesn't particularly add to our collective knowledge and the resolution of the actual cause.
RE: Core One crash/restart
What is not clear is whether people are having this problem with pre-assembled or kit printers.
If you read back through this long thread, you will find that the issue has been reported for both, kits and factory-assembled printers.
RE:
Thanks for this thread!
For my Prusa Core One, all I had to do was unscrew one screw from the X motor and the Y motor, then sand the surface down to the bare metal. After that, I tightened the screw back on securely. I also used a lock washer. To do this, I just had to remove the lower left side panel.
Good luck! It was a really nasty problem!
Just had another crash
Just swapping the nozzle for a different size and got a crash/restart followed by an error.
RE: Core One crash/restart
It seems that when you replaced the nozzle, you managed to grab the wires leading to the thermistor or the heating element. Check carefully whether they are in order and whether the connectors are connected correctly. If you have torn off the wires, order a new thermistor or heating element, because you can't fix this at home.
RE: Core One crash/restart
I was supporting the block with pliers. The wires had slack and everything looked fine. I started loosening the tip with a socket and super mini ratchet. When I was about halfway out it crashed. I finished changing the nozzle and it worked fine all day. Oddly, the next thing on the list of things to bond/ground is the extruder block. I wonder if me kneeling on the carpet loosening that thing caused yet another spike? If it did, that would seem to indicate that my TVS Diode did not do it's job.
RE: Core One crash/restart
I was supporting the block with pliers. The wires had slack and everything looked fine. I started loosening the tip with a socket and super mini ratchet. When I was about halfway out it crashed. I finished changing the nozzle and it worked fine all day. Oddly, the next thing on the list of things to bond/ground is the extruder block. I wonder if me kneeling on the carpet loosening that thing caused yet another spike? If it did, that would seem to indicate that my TVS Diode did not do it's job.
From changing nozzles frequently I've in the past stressed the thermistor wiring and caused it to fail. That's why I keep spares around.
RE: Core One crash/restart
+1 for reboot due to static discharge on pre-built Core One L. In both cases, I touched the corner of the case near the buddy camera.