Prusa3D Forum - Recent Topics

Which preset for which nozzle?

ACL — Sat, 02 May 2026 18:26:08 +0000

I just finished building my Core One+ last week, and I've been using the included nozzle (High-flow Prusa Nozzle brass CHT - 0.4 mm) and also the default print profile. Can I use the high flow profile or do I need to buy a different nozzle?

Which nozzles allow me to use the "high flow" profiles? Is it any nozzle called "high flow" and also the CHT nozzles?

Thanks in advance

Enclosed MMU3 on Core One has suddenly become nonfunctional after a filament swap

ViewtifulSchmoe — Sat, 02 May 2026 18:14:54 +0000

The MMU3 on my Core One has become nonfunctional after changing the filament. It completed several small prints yesterday, so I don't know what happened. Here is the sequence of events immediately before the unit stopped working:

I pulled all filament out of the MMU3 and the filament buffer manually.
I loaded new filament into slots 1 through 4 by following the "Preload to MMU" prompts.
I used the "Cut filament" prompt to check that filament 1 was properly loaded. I did this because the loose filament in the buffer repeatedly got caught on something as I put the cartridge back into the buffer.
I hit the reset button because the MMU3 got caught in a loop trying to cut filament 1, indicating that the filament had become partially unloaded (as I had expected).

Since then the MMU3 has been completely nonfunctional. When powering on, it does not attempt to home at all. There are no motor noises of any kind. The filament selector stays on filament slot 1, and the LED for slot 1 is lit green. The filament selector buttons yield no response. The MMU3 reset button causes the unit to flash lights as if rebooting, but then it goes back to the same state: stuck on filament slot 1 with the slot 1 LED lit green. At no point does the Core One's LCD screen indicate that an error has occurred.

I have taken the following steps to troubleshoot / resolve the problem:

I have verified that the FINDA sensor is not detecting any stray filament by inserting a small piece of filament into the sensor. When I insert the filament, the red LED on the FINDA turns off. When I remove the filament, it turns on. There are no other changes to the MMU's state.
I have re-flashed the MMU3 with the latest firmware. PrusaSlicer indicated that the firmware flash was successful. However, upon rebooting, the MMU3 returned to that same state: stuck on filament slot 1 with the slot 1 LED lit green.

I am inclined to think that the filament selector motor has failed, but I want to rule out other possibilities before I contact support for a warranty replacement. What other troubleshooting attempts should I take?

SpoolCore SFF – Mini-ITX case from Prusament spools

Ghiklm Nopqsrt — Sat, 02 May 2026 17:38:19 +0000

Had to burn a few candles to make this thing in time for the current Printables contest - Upcycling of the new Prusament spools.

My idea is SpoolCore SFF – Mini-ITX case from Prusament spools - see actual photos below.
Would be interesting to hear what people would say on it.

Whole PC can be fit between 3 upcycled spool sides:

Question about storing and using filament

Phil — Sat, 02 May 2026 17:05:04 +0000

After drying a spool of filament (at the correct temperature and for the correct time per the manufacturer's guide). Then I put that filament in a dry box with desiccant till I need it. How long will that filament stay dry and ready to print in the dry box?
Does this dry box time vary by filament type?

INDX & Buddy 3D Camera

Tom De Winter — Sat, 02 May 2026 15:23:37 +0000

I'll be starting the build of my Core One soon while I wait for my INDX to ship. I see some advising in the build instructions to route a USB cable for the Buddy Cam making later addition of the camera easier.

Do any of you know if the Buddy Camera will be compatible with the INDX system?

Buddy 3D camera - No Rotate option in connect

droxel — Sat, 02 May 2026 13:02:08 +0000

My Buddy3D camera is mounted upside down. I can't flip the view in Prusa Connect. I have read the different posts on this subject, and people are just stating to hit the rotate button on the view to flip the camera view. This works for me in the app, but there is no rotate button showing up for me in Connect.

MMU Boot Rattle

GregorPrinter — Sat, 02 May 2026 12:32:02 +0000

Hello everyone, I recently installed my Prusa MMU3 on a Core One printer and I’m experiencing an issue during startup.

Right after booting the printer, the MMU starts moving and produces a loud rattling noise for about one second. It sounds like the idler is trying to find its position. After that, the unit seems ready and no error messages are shown.

I did some research but couldn’t find any videos or examples where the MMU behaves like this. In other setups, the idler appears to move smoothly to its end positions without noticeable noise.

I already checked the following:

The idler drum rotates freely
The small gap to one side (as described in the assembly instructions) is present
The idler is firmly mounted on the shaft
on both the MMU and printer is up to date
No error messages are displayed

Despite all of this, the rattling noise during initialization remains.

Has anyone experienced similar behavior or has an idea what might be causing this?

THANK YOU SO MUCH

Feature: auto-clean delete Prusa Connect Files

KonstisSFX — Sat, 02 May 2026 06:19:55 +0000

Hey,

I recently run into the Issue that i couldn't upload print files though Prusa Connect because the Cloud Space was full.

Then I noticed that there where a decent amount of files saved, that wehre blocking the space.

Shouldn't those files be deleted after a successful download to the Printer?

Best Regards

I strongly advise against buying a Prusa XL or Prusament PCCF.

ktastrophe — Sat, 02 May 2026 02:38:24 +0000

I recommend NOT buying the XL or Prusament PCCF in 2026. I am an experienced 3D printer, having started in 2016 with an Original Prusa i3 MK1. I bought two rolls of PCCF for my XL and have gotten ZERO successful prints out of that 220 dollar investment.

Updated firmware. Downgraded firmware. Upgraded firmware. Printed mods. Removed mods. Enclosure. No enclosure. Glue, no glue, stock settings, tweaked settings, firmware errors, parking issues, dropped support for my 5000 dollar printer. Clog after clog, multiple nozzles, large, small, stock. HF, not HF, hardened and not hardened.

Support for the XL: Zero

"Flagship status" claim: Completely superseded.

Today, it clogged while I was at work on an 8 hour print. I came home, fixed it. Thirty minutes later, I had a giant PC blob of death, ruining the hotend, the print, and finally, my relationship with Prusa. 2016-2026. I'm done. This printer sucks. Mine hasn't worked reliably since 2023, and in 2026 (eons of time, per many people on this forum), it still doesn't work.

I owned ten MK3S/+. I brought one to Antarctica. They were great. I strongly support Prusa's open source ethos. I cannot condone the lack of support for this printer.

The abandonment of the platform was the first straw. The realization that, yet again, I cannot get my 5k printer to work after following all troubleshooting, after a decade of successful printing on Prusa's platforms, was in fact the final straw. If yours works, good - I am very glad for you and hope you get many more great prints out of it. Mine doesn't.