RE: Core One skipping steps/Layer shift
I stumbled upon this thread after I'm having the same issue... but mine is at exact same height.
I did belt tuning, in-fact.. more than 5 time in last 4 weeks to reduce VFA, also calibrated IP and phase step.. Between the first and second, I have tuned belt and between the 3d (you will see a video) I loosen belt and tuned again with prusa's built in manual belt tuning.
- I sliced using Orca slicer
- Did turn on the Avoid wall crossing
- PLA 0.2mm FAST profile
- NOT IN VASE mode, I wanted to print with small infill..
So, did you try to turn "avoid crossing perimeters" OFF? According to multiple posts above, that option seems to be what triggers the problem in PrusaSlicer, causing it to generate unreasonable moves in GCode. I am not sure whether BambuStudio and OrcaSlicer have inherited the problem from PrusaSlicer, but being based on the same code, they might well have.
Not sure why you mention Vase mode. I don't recall seeing that mentioned as a potential cause for the problem?
RE: Core One skipping steps/Layer shift
Hi,
I haven't tried without the "Avoid wall crossing", I did try to slice from Prusa Slicer with the "Avoid crossing perimeters" and it did crash at the same point. I will give it a try with these options turned off later and update here the results.
I replied here with the avoid wall crossing/Avoid crossing perimeters options turned on, because I want to use this options to reduce stringing.
I also noticed that Prusa sliced model print slowly compare to Orca slicer, but that could be down to how the in-fill and other variations.
I mentioned the vase mode, just to clarify that I'm not printing this in vase mode (This model is good to print in vase mode).
RE: Core One skipping steps/Layer shift
See my post earlier. Still having problem, but now about 10% of prints fail instead of 100%. Have improved odds with the following: 1) Added 10mm ceramic heat sinks to three stepper drivers. 2) Left cover off of pcb enclosure. 3) Turned off slant Z moves (collision?). 4) Reset machine before each print. 5) Modified all of printer accelerations and top speeds to 3/4 of default. Of these, 4 and 5 seemed to cause greatest improvement. They hint at a software and friction problems, respectively. Regardless, the problem is stepper skipping and losing sync. The screaming sound is a stepper motor microstepping out of major step sync. Can't track down whether Z binding is first - causing collision and then X and Y skips.
RE: Core One skipping steps/Layer shift
See my post earlier. Still having problem, but now about 10% of prints fail instead of 100%. Have improved odds with the following: 1) Added 10mm ceramic heat sinks to three stepper drivers. 2) Left cover off of pcb enclosure. 3) Turned off slant Z moves (collision?). 4) Reset machine before each print. 5) Modified all of printer accelerations and top speeds to 3/4 of default. Of these, 4 and 5 seemed to cause greatest improvement. They hint at a software and friction problems, respectively. Regardless, the problem is stepper skipping and losing sync. The screaming sound is a stepper motor microstepping out of major step sync. Can't track down whether Z binding is first - causing collision and then X and Y skips.
If your issue is indeed sporadic step loss due to overheating or firmware flaws, it might be different from what most others have described. I think most cases of step loss discussed here could be attributed to the invalid GCode which the slicer generates in "avoid crossing perimeters" mode.
Have you double-checked the belt tension, to ensure that there are no resonances which could end up in stalling? If you have the accelerometer, running the Input Shaper calibration might also be worthwhile.
I would not expect the ceramic (?) heat sinks to help much, since the Trinamic chips dissipate heat mainly via their die-attached pad and the PCB copper area, not via their plastic packages.
RE: Core One skipping steps/Layer shift
Update: I try printing with `avoid crossing perimeters` turned OFF, using Orca Slicer and 0.25mm Speed profile; Print completed without issue.Lots of stringing, but no layer shift. That means, on my part, it is a slicer issue instead of hardware issue!
I tried some simple cylinder and oval shapes with `avoid crossing perimeters` Turned ON and they printed without issues too..
I'm guessing that complex models have some issues. I noticed that printer made loud noise just before layer shift happened... It sounded like banging on the side of the printer.
Shouldn't the Printer detect this as Crash and Home before continue?
RE: Core One skipping steps/Layer shift
have the same issue. Switch off cross perimeter. Still have layershift almost on the same spot and a lot of stringing. Check the belt tension many times. Very frustrating
RE: Core One skipping steps/Layer shift
the loud bang is what people have reported hearing when the machine tries to do a high speed direction change, typical of the usage of "avoid crossing..."; other layer shift with loud noise have been reported when filament gobbled up on the extruder or on the model and the extruded collided with the model.
Since you are seeing a lot of stringing, it may be worth checking if your filament is dry. Even rolls taken out of sealed bags for the first time may be not dry enough.
Update: I try printing with `avoid crossing perimeters` turned OFF, using Orca Slicer and 0.25mm Speed profile; Print completed without issue.Lots of stringing, but no layer shift. That means, on my part, it is a slicer issue instead of hardware issue!
I tried some simple cylinder and oval shapes with `avoid crossing perimeters` Turned ON and they printed without issues too..
I'm guessing that complex models have some issues. I noticed that printer made loud noise just before layer shift happened... It sounded like banging on the side of the printer.
Shouldn't the Printer detect this as Crash and Home before continue?
RE: Core One skipping steps/Layer shift
- its lw pla ht. This is why i make so much stringing. This is exactly why i need avoid cross perimeter. And i have dryed my filament befor use.
RE: Core One skipping steps/Layer shift
I have had the layer shift issue too, but I never turned on those settings, so I know for a fact that is not the cause. I fixed my printing issues by moving the purge block right next to my print, and the next time I printed a long tall object, it finished just fine. Mine was not circular either. So it will happen with or without those above mentioned settings, and on almost any shape, not like some here are saying it only happens with tall circular objects. It seems to do with the high speed directional changes of the print head assembly. By moving the purge block right next to the object, the printer seems to not accelerate as quickly, and then no layer shift occures.
Design it, Print it!
RE:
repeating from the other thread (and repeating: "don't fix it if it ain't broken"): Is it possible that the umbilical gets stuck between print head and left stepper motor? It happened to me when hiding the wipe tower in that corner... usually causes diagonal layer shifts (generally: a "soft" obstacle, the head wiggles around somewhat, slipping only one motor when the first axis yields. Where a "hard obstacle" that doesn't allow any evasion seems more likely to slip both XY steppers independently => non-diagonal. But this may be more astrology than science).
And MMU is more sensitive to it as it replaces the 90-degree PTFE guide (which gives some support to the umbilical) with a straight one.