Prusa3D Forum - Recent Topics

Requests filament change just before starting to print on only one filament profile

Vadar007 — Tue, 12 May 2026 13:42:07 +0000

Having a strange issue with a particular filament profile. I copied the Das Filament PLA profile and modified the bed and nozzle temperatures. Anytime I try to print with that profile I get a "Reloading Filament" message followed by a "Stuck Filament Detected" right after it does it's last nozzle purge/sweep to begin printing. If I unload and reload the filament it resumes the print and everything works fine. I do not get this behavior when I use the default Das Filament PLA profile, the Prusament PLA profile or a copied profile of the Generic PETG profile which I modified for Das Filament. If I turn off the "Stuck Filament Detection" setting it works as expected. Tried recopying the default profile multiple times with the same results. What am I missing here?

lightbox farben nebeneinander haben lücken und haften nicht zusammen

Drepbop — Tue, 12 May 2026 12:41:46 +0000

Hey ihr Lieben,

ich wollte eine Lightbox drucken und habe das Problem, dass ich beim Druck mit verschiedenen Farben nebeneinander immer Löcher zwischen den Farben habe und sie auch nicht wirklich verbunden sind.

Habt ihr Tipps oder hattet ihr mal ähnliche Probleme und könnt mir helfen?

Danke im Voraus!

Prusa MK3.5S layer calibration tool issue

Andrew M — Tue, 12 May 2026 06:11:24 +0000

Hello,

For context I own 4 mk3s printers and one I have recently converted to Mk3,5s and 0.6mm nozzle after putting roughly 1500hours on it. I am finding using the first layer calibration tool gives good results but when you go to print a part at say 0.32mm layer height 0.2mm first layer, the first layer is way off and I have to adjust z offset to get a good first layer again. I also have to slow it down to roughly 50% speed. once I have a good first layer I can crank the speed back up to 100% and get a good part.

It appears like the first layer tool doesn't apply z offset appropriately depending on what layer height you print at. same issue for PLA OR PETG smooth or textured bed. No improvement with dried filament and printer in tent. Tried clean beds (soapy water) or with glue stick no difference.

Slicer 2.9.4

Firmware 6.5.3

Core One+ Calibration and Filament Sensor Issue

Markus Reichert — Tue, 12 May 2026 06:00:59 +0000

Good morning,

I have been experiencing problems with my Core One+ for the past few days. It is no longer printing properly, and during calibration the filament sensor test fails. The printer had been running without any issues since December 2025.

Unfortunately, I have not been able to determine what is causing the issue. I have attached the log.txt file log from this morning — perhaps someone can identify the problem from it.

I would greatly appreciate a quick response.

Thank you very much in advance for your help.

Kind regards,

Markus Reichert

Layers squish at 40%

Jago1400 — Tue, 12 May 2026 02:51:38 +0000

Having trouble printing this rod. At about 40% complete the nozzles is too low into the model. Not sure hwy it won't let me upload the 3mf file.

Prusa, this is all your fault!

Conrad — Mon, 11 May 2026 19:55:32 +0000

When I built my Core One, my wife developed a taste for these things. And then I did. First, it was by the case. Today the store was out of the cases, so the 3.5 lb bag came home!

Weird perimeter printing

goldensuneur — Mon, 11 May 2026 16:58:44 +0000

I noticed that for the first few layers PrusaSlicer is adding a lot of small outside perimeters and a lot of travel in between instead of extruding two continuous perimeters like it does a few layers above. I'd like to always have continuous extrusion for better surface finish of the print and I cannot switch to vase mode because I need 2 wall thickness for increased opacity. It it this model printed on a core one+ and all defaults profiles show the same behavior. Do you know which settings should I tweak to get rid of these small perimeters in the first layers ?

Many small perimeters causing a lot of travels and irregularities in the print:

Then a continuous extrusion:

Suddenly PrusaSlicer is no long able to send gcode to Prusa Connect

mbiasotti — Mon, 11 May 2026 14:55:51 +0000

I have three printers on Prusa Connect: Core One, Mk4, and Mk3.5. All have been working well for a while, and when I slice, I'm able to send directly to one of these three printers from Prusa Slicer using "Send to Connect" with the button in the lower right (instead of exporting gcode).

Now, all of a sudden, I do not get the option "send to Connect".

All three printers are seen by my Prusa Connect Web interface, it just seems that Prusa Slicer does not see them?

What gives?