MK4S +MMU3 + 6.40 Alpha FW - Stuck at Reloading Filament - 99% Parking
 
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MK4S +MMU3 + 6.40 Alpha FW - Stuck at Reloading Filament - 99% Parking  

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JGeiger2024
(@jgeiger2024)
Active Member
MK4S +MMU3 + 6.40 Alpha FW - Stuck at Reloading Filament - 99% Parking

Printer gets stuck with status of 99% Parking.

After starting a print, the temperatures reach preheat, bed leveling executes, extruder heats to temp, extruder produces purge line at the left front of the build plate, then lifts and moves to the right.  Sequence halts at the 99% parking state.  The only recovery is to RESET.

Anyone seeing this?

Posted : 23/09/2025 3:31 am
1 people liked
fskifte
(@fskifte)
Member
RE: MK4S +MMU3 + 6.40 Alpha FW - Stuck at Reloading Filament - 99% Parking

I see this to after firmware update to 6.4.0-alpha+11774 

its not on all prints it happens

but when it happens I do power off/on and started the same print .. then it runs flawless.

hope for fix in next firmware

Posted : 23/09/2025 8:17 am
BeKay1211
(@bekay1211)
Member
RE: MK4S +MMU3 + 6.40 Alpha FW - Stuck at Reloading Filament - 99% Parking

Seems like this did not get fixed on the RC

Posted : 23/09/2025 4:22 pm
James Kirk
(@james-kirk)
Trusted Member
RE: MK4S +MMU3 + 6.40 Alpha FW - Stuck at Reloading Filament - 99% Parking

The same here on my mk4s with the alpha-firmware.

After a reset it works without problems

Posted : 23/09/2025 6:02 pm
Mike B
(@mike-b-3)
Estimable Member
RE: MK4S +MMU3 + 6.40 Alpha FW - Stuck at Reloading Filament - 99% Parking

This happened to me last night.  It's weird - I "paused" the job from Prusa Connect, no change.  I "cancelled" the job from Connect, still no change.  But I was able to get it out of the stuck state (at least from a UI perspective) and was moving around the menu, although I don't think any menu items were able to be clicked.
I pushed the reset button and restarted the print after clearing the plate and it worked fine.  Definitely looks like a bug.

Prusa MK4 since Jan 2024, Printables: @MikeB_1505898

Posted : 23/09/2025 9:41 pm
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