RE: 6.4.0-RC Firmware for Prusa CORE One
Auto open/close Vent is not fully working. Opens or closes the Vent only after power up / start first print.
After print it is not closing the vent, what would be a good idea because of dust can come in
I guess you could still use the custom start and end Gcode, as in the original community version: https://www.printables.com/model/1323846-core-one-automatic-chamber-vent
RE: 6.4.0-RC Firmware for Prusa CORE One
@hyiger
Nice, super interesting. The most exotic thing I've printed on my printers is PC-CF and PETG-CF. I'd 400C nozzle is pretty darned hot. What bed and chamber temps do those materials you're talking about need. All the stuff inside that enclosure we need to be able to stand up to the increased temps.
RE: 6.4.0-RC Firmware for Prusa CORE One
Vanilla out of the box, batch 3
@huskyte
was your core one upgraded from an MK4S, built from kit, or pre-assembled? I'm curious if any issues are folks are having with core one are related to reusing some components from MK4S upgrade etc. My core one was upgrade from MK4S, so reuses the heatbed, powersupply and main board from the MK4S. Other than initial issues I had after I just built it, it's reasonaably solid for rigid filaments using the 6.3.4 firmware. I prints 92A+ tpu ok, with the bogie mod in the extruder(to prevent filament winding around the extruder gear). I haven't had any other issues with it. But I also haven't tried any of the 6.4.x RCs either. I could see issues with new/older parts causing variation in behavior. Just random thought on my part.
RE: 6.4.0-RC Firmware for Prusa CORE One
I'm curious if any issues are folks are having with core one are related to reusing some components from MK4S upgrade etc.
I think there are just several aspects of the Core One design which are a bit "on the edge". It probably depends more on luck whether they work or cause problems, than whether the printer was factory-built, a full kit, or an upgrade:
- Long ribbon cable to the display, maybe even more problematic because it runs along the stepper motor cables, can cause display malfunction at full data rate.
- Cable routing in the umbilical cord to the print head, which may cause excessive crosstalk from heater to load cell.
- No defined grounding path for the XY stepper motor chassis; if the paint layer is intact, lack of grounding causes static buildup and crashes.
- Precise sensing of home position via motor stalling depends too critically on the bumping pattern, and hence gantry alignment.
- ... and probably a few more I can't think of at the moment.
The "different pitches in the three Z lead screws" may be exclusive to full kits and upgrade kits, since they combine motors from different manufacturing lots. (Two from the MK4S or the pre-packaged motor kit, one extra.) In contrast, I assume Prusa technicians get three Z motors from the same shelf when building printers in the factory.
Mine was update from 3.9s parts. No electrical problems whatsoever. Homing was a different problem though and I spent several hours on line with support and it tuns out it was none of the things they suggested and we tried. The answer was mismatched steppers! 200 and 400 steps per rev steppers simply don't work together.
One problem I have, and is still ongoing is loading filament - It has a habit of not feeding down the tube on the nozzle and failing ramming. Never happened previously and I can see, potentially, where the problem lies. The supplied Prusa part is poor. The sloping slot on the part the nextruder mounts to doesn't line up properly with top of the filament tube. I need to print another when I get around to it. Fortunately I don't change filament that often and often use a roll fully and dread frigging about when I do! I blame this on two blocked HF nozzles I have where the filament has baked solid in the end and I've had no joy in clearing them! Back on CHT brass nozzles which do clear with a cold pull when blocked. I may install my V6 nozzle adapter as a last resort as I'm out of expensive ones and I've lots of V6 nozzles in stock.
RE: 6.4.0-RC Firmware for Prusa CORE One
Wouldn't this just be end and start gcode?
print end: always close
Print start: if set temperature above 30 close the gates
Auto open/close Vent is not fully working. Opens or closes the Vent only after power up / start first print.
After print it is not closing the vent, what would be a good idea because of dust can come in
RE: 6.4.0-RC Firmware for Prusa CORE One
Wouldn't this just be end and start gcode?
print end: always close
Print start: if set temperature above 30 close the gates
Auto open/close Vent is not fully working. Opens or closes the Vent only after power up / start first print.
After print it is not closing the vent, what would be a good idea because of dust can come in