Prusa3D Forum - Recent Topics

Attention notification when starting a print after manual preheating

andyshinn — Wed, 22 Apr 2026 18:20:16 +0000

An annoyance I have with the software (somewhere in the printer -> Connect pipeline) is that it will send a "Attention" notification when there is nothing to attend to. This seems to happen specifically when I start preheating manually and then send a print to Connect for the printer. It will send a notification that the printer needs attention. But there is nothing to do and it starts the print normally. Whatever is causing this attention notification seems like a bug and would be nice to eventually get fixed.

Can MINTEMP threshold be lowered on Prusa MK3S?

CarolynJGraziani — Wed, 22 Apr 2026 13:07:41 +0000

My printer is in a room that drops to ~14–15°C when idle, but it keeps triggering MINTEMP errors around 18°C on both nozzle and bed.

Is there a way to lower this threshold (e.g. 10–12°C) in firmware or config? It’s causing issues when the printer is idle or paused, and I often lose prints because of it.

Has anyone done this on MK3S, or is there a place to request this change?

Thank you

Rear of full bed print rippling

Nate B. — Wed, 22 Apr 2026 10:54:52 +0000

I'm trying to print a full sheet print (a dry box for my filament) and found that the rear 20 or so mm rippled in an odd way. This is my first full sheet print with my Core One + (I assembled). Since this is near the rear exhaust fan, could this be an airflow issue or something else that I assembled wrong? Any advice on what could be causing this is greatly appreciated. Note: The top vents are opened fully and the slicer used all the default settings.

Unload Filament with new SW (MK4s and MMU3) does not work

Volker — Wed, 22 Apr 2026 08:08:34 +0000

After my update to the new SW-Version (6.5.3 and 3.0.4) the unload of the filament after the print does not work. I have the nextruder with the "standard" sensor configuration (read contact). It did work perfectly with the old SW. But now after the print the filament is not retracted by the MMU and a "filament present" error of the filament sensor appears. After pulling the filament manually (without any force) the MMU is pulling back.

The same happens when I load the filament to the nozzle. This is working because I have selected the "standard nextruder". But unloading does not work.
Is there some configuration I need to modify?

Selling my Used XL5 in North Carolina

abright — Wed, 22 Apr 2026 04:20:18 +0000

Bought on a whim second hand because I wanted bigger and faster. Turns out it’s too big and I need an enclosure.

If anyone’s around the South specifically Charlotte, NC and is interested, let me know. Thanks!

Core one failing Y calibration

Basicguy — Tue, 21 Apr 2026 20:34:11 +0000

Just assembled core one for son, was working great, transported very carefully in car on padding, set up in his apt, and keeps failing Y axis calibration. Found a tie on left side that was obstructing, fixed that but still fails. Gantry is straight, belts tuned, checked y motor set screw on flat and tight. Noticed when perform y axis cal, the y position does not always change, yet set screws are tight and on flat, took right side off to ensure wasn’t filament cable and not impeding. Some time it fails at back, and sometimes fails in front before reaching y home. What else can I check?