RE: Core One crash/restart
Can it be that this problem (zip tie in the middle on the x-belt) is our static electricity problem? Tomorow i will the motors grounded and cut the zip tie.
RE: Core One crash/restart
Hello, can static electricity build up if the belt rubs against a cable tie? In my case, the upper belt rubs against the cable tie that's attached to the fan bracket of the chamber ventilation system to hold the cable of the chamber temperature thermistor. It's directly above the center Z-axis. The core one is factory build.
This is why server rooms typically have a 42% humidity level; top prevent static build up / discharge.
RE: Core One crash/restart
Hello, can static electricity build up if the belt rubs against a cable tie? In my case, the upper belt rubs against the cable tie that's attached to the fan bracket of the chamber ventilation system to hold the cable of the chamber temperature thermistor. It's directly above the center Z-axis. The core one is factory build.
Short answer is 'yes', however the belt is not supposed to rub against the cable tie. In the build instructions Prusa specifically mention not to do this, i.e. ensure the tie is correctly positioned and tight enough that it doesn't rub against the belt.
RE: Core One crash/restart
Hello, can static electricity build up if the belt rubs against a cable tie? In my case, the upper belt rubs against the cable tie that's attached to the fan bracket of the chamber ventilation system to hold the cable of the chamber temperature thermistor. It's directly above the center Z-axis. The core one is factory build.
That can contribute to static charge buildup. But it seems likely that the belt can get charged even without that belt-to-plastic contact.
That cable tie in the back of the printer got quite some attention here during the early Core One kit-building days, and in most printers it did not touch the belts once the belts were tightened. Yet, the printer crashes upon fast, wide movements (with stepper motors that are electrically isolated) seem pretty common.
RE: Core One crash/restart
So Prusa did not work as there own instructions. It comes so from the factory.
RE: Core One crash/restart
You can clearly see wear marks on the cable tie. I can take a picture. But anyway, tomorrow I'll install flap discs (Fächerscheiben) and measure with a multimeter.
RE: Core One crash/restart
Here is a nice document to static electricity in belt driven systems. In German. Also is a lot of stuff to read in the Creality Forum about this problem. The only way to solve is grounding the steppers and use a powergrip gt2 "RF" belt that is antistatic version. We use here the higher temperature version "E" for EPDM.
RE: Core One crash/restart
The only way to solve is grounding the steppers and use a powergrip gt2 "RF" belt that is antistatic version.
For the Core One, it is apparently sufficient to ground the stepper motor chassis. User report consistently say that this resolved the "crashes upon long fast moves" problem, even with the standard GT2 belt (which is not the RF version). Maybe that leaves some residual charge somewhere on the belts, but if so, it does not seem to cause problems.