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prusa3d / PrusaSlicer

G-code generator for 3D printers (RepRap, Makerbot, Ultimaker etc.)
https://www.prusa3d.com/prusaslicer/
GNU Affero General Public License v3.0
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Enable "Steeper ramp before obstacles" (printer/extruder configuration) by default - when disabled unpredictable crashes/layer shifts occur #13235

Open RPospisil opened 2 months ago

RPospisil commented 2 months ago

Is your feature request related to a problem? Please describe. I've been suffering from unpredictable crashes and/or layer shifts on short (just on the 1st layer) or large prints (in 7th hour of 9 hours print on the same point). I suspected filament, extrusion temperature, USB flash disk, IS, .... but none of them was the root cause. After observing videos of failure I found that the issue was caused by the ramping lift - nozzle crashes to the near extrusion, so it ended either as crash or layer shift (when the phase stepping was enabled, this shift was typically ~10-20 mm) Further it was strange because when I printed the same model a few moths ago without any issue.

So I played with various settings of travel lift and found out that enabling "Steeper ramp before obstacles" resolves that issue

Describe the solution you'd like Enable "Steeper ramp before obstacles" by default in printer/extruder configuration

Describe how it would work Just change default printer extruder configuration.

Describe alternatives you've considered I enabled "Steeper ramp before obstacles" on my printer's configuration.

Additional context I observed the same 'mystery' issue on forum - e.g., https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-assembly-and-first-prints-troubleshooting/massive-layer-shift-after-24-hrs-of-flawless-printing/#post-718449

codingcatgirl commented 2 months ago

Wow, this actually fixed the issue i was having. Yeah, it would probably be good if this was the default.

MartinMajewski commented 2 months ago

Same here. I experienced the same issue with shifted layers on the Y axis no matter the object's orientation and on all of my Mk4 printers, of which only one has the MMU3 installed, and I don't even print multi-color in this case. Then I came across this option, and it seems to help.

However, the print time increases significantly (e.g. from 3:13 to 3:40). I don't see a plausible reason for this.