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[BUG] After powering on, Z axis moves up twice during filament change #4838

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degroof opened this issue Jan 19, 2025 · 2 comments · May be fixed by #4839
Open

[BUG] After powering on, Z axis moves up twice during filament change #4838

degroof opened this issue Jan 19, 2025 · 2 comments · May be fixed by #4839
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@degroof
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degroof commented Jan 19, 2025

Printer model

MK3S/+

MMU model

No-MMU

Firmware versions

3.14.1

Upgrades and modifications

none

Printing from...

SD Card

Describe the bug

Minor annoyance: After turning on the printer, the Z axis moves up twice while I'm changing the filament: once when unloading, once when loading. The second one isn't really necessary, and can result in the Z axis topping out if it's already near the top.

Again, not a big deal but hopefully an easy fix. And it only seems to happen after turning the power on. I thought performing an auto-home after startup would be a viable workaround (assumption: firmware doesn't know actual Z height until homed) but it does it in that case too.

How to reproduce

  1. Power on the printer
  2. Select "unload filament" (printhead heats up)
  3. Press knob to eject filament (printhead moves up and ejects filament)
  4. Insert new filament (printhead pulls in filament, then moves up again)

Expected behavior

  1. Power on the printer
  2. Select "unload filament" (printhead heats up)
  3. Press knob to eject filament (printhead moves up and ejects filament)
  4. Insert new filament (printhead pulls in filament, with no additional Z movement)

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No response
@degroof degroof added the bug label Jan 19, 2025
@3d-gussner 3d-gussner self-assigned this Jan 20, 2025
@sarusani
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sarusani commented Jan 24, 2025 •
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Loading

The configured minimum raise for unload is 20mm, for load it's 50mm. Therefore the head moves up an additional 30mm.

I will change the behavior to align both values (to 35mm) for a future release.

@degroof
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degroof commented Jan 24, 2025

Ah! Is that what it's doing? Makes sense now. Thanks for the explanation.

@sarusani sarusani linked a pull request Jan 24, 2025 that will close this issue
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@3d-gussner 3d-gussner assigned sarusani and unassigned 3d-gussner and sarusani Jan 24, 2025
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Align MIN_Z raise for unload & load sarusani/Prusa-Firmware
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@degroof @3d-gussner @sarusani