MK4S asks me to unload and load filament before the printing starts
 
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MK4S asks me to unload and load filament before the printing starts  

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Marteinn - 3DP Iceland
(@marteinn-3dp-iceland)
Active Member
MK4S asks me to unload and load filament before the printing starts

Hi.

I have a Prusa MK4S printer, and I'm getting issues when I start a print, - It does not happen all the time, but most of the time when I start the print.

What happes is the printer goes to the bed sensing / leveling process, and the heats up the filament. When heated, it starts the purge in the air on the left front side of the bed, and moves down to complete the purge, At the end of the (Ithink), normal lengh of the purge, the printhead moves up and to the right posision, and asks to unload the filmanet, - when I do, It wants me to reload the filament, and when I do and it has finished purging a bit, it starts printing without issues.

 

what can be the couse of this?

 

Posted : 15/01/2026 4:20 pm
miroslav.h4
(@miroslav-h4)
Prominent Member
RE: MK4S asks me to unload and load filament before the printing starts

Adjust the filament sensor on Nextruder!

Posted : 15/01/2026 4:41 pm
Marteinn - 3DP Iceland
(@marteinn-3dp-iceland)
Active Member
Topic starter answered:
RE: MK4S asks me to unload and load filament before the printing starts

can you point me a little futher, - how do I do that?, any link to a guide?

Posted by: @miroslav-h4

Adjust the filament sensor on Nextruder!

 

Posted : 15/01/2026 4:52 pm
Marteinn - 3DP Iceland
(@marteinn-3dp-iceland)
Active Member
Topic starter answered:
RE: MK4S asks me to unload and load filament before the printing starts

I belive I found the issue.

 

the printer was complaining about stuck filament, - I was printing PLA at 200°C, - I changed the temp to 220, and now I have started the same print 5 times without issues. - so it was my filament profile that was the issue 🙂

Posted : 16/01/2026 12:35 pm
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