Prusa3D Forum - Recent Topics

PETG takes too long…

Steff137 — Sun, 03 May 2026 11:42:52 +0000

Hello everyone!

I find that the start of a print is too long with PETG. I measured it, and the printer takes exactly 16 minutes before starting the print. Do you have any suggestions to improve the startup time?

Thanks for your replies! :)

Where is the Windows Installer?

JOHNE — Sun, 03 May 2026 10:11:00 +0000

Running PrusaSlicer for 1-1/2 years. I am getting a pop-up for an upgrade so I download the zip and it only contains the executable and library files. No windooz installer. I don't remember having to manually install this thing(?)

I googled around to see if there was some announcement about dropping the Windows package. I visited all the usual places (Github, Downloads Page) and they only have the .zip file with distribution files. I googled to see if anybody posted directions on manual installation and the Youtubes all show a download / execute installer process.

What am I missing? I really don't want to have to manually install the thing. I don't do that for the other 4 slicers on my machine.

printer gcode

SdeL — Sun, 03 May 2026 08:45:33 +0000

how can I control the vent grid opening/closure in the printer gcode

Repeated Bed Leveling failure

Steven Clarke — Sun, 03 May 2026 00:39:39 +0000

OK, how do I fix this?

Core One, does 49 points, and says the bed is not flat. I say yes to do the Z-alignment, the bed goes all the way down, then comes back up, and it does the points over again, and still fails. I have turned it off, same problem. I pulled out the print sheet, cleaned it well, cleaned the heating plate well, flipped the print sheet over. None of those fixed it.

Where in the build instructions do I need to go back to to check something?

Power XL Filament Loader for Prusa XL (3-5 filaments)

Ro3Deee — Sat, 02 May 2026 23:00:46 +0000

https://www.printables.com/model/1647918-power-xl-345-filaments-loader-for-prusa-xl

video: https://youtu.be/q9LNOFeEZv0?si=wQU-Q-L4QAMuqE0t

Soluble support material(s) question

chmax — Sat, 02 May 2026 21:08:32 +0000

I 'd like to start soluble materials for the contact layer of support structures and having a hard time sorting out what soluble filament(s) to use with what. I use PLA, PETG, PCBlend, and ASA (there is also a roll of ABS still sitting in the shelf but rarely used).

May I kindly ask those that have experience with this to share it here? Thanks in advance.

Filament settings

Phil — Sat, 02 May 2026 20:38:26 +0000

I am going to print using 3DTech CarbonX ASA+CF. 3DTech gives a nozzle temperature range and a bed temp range.
Prusa Slicer's filament form has Nozzle temp first layer and other layers, same for bed temperature. And chamber nominal and minimal.

Do I use the highest temps given by 3DTech or some mix? How am I to know which to use? Thank you,

Collision detection: bed won't rise

xrayspecs — Sat, 02 May 2026 19:41:57 +0000

The heat bed on my Core One+ won't rise past the screws on the right wall. When I attempt to print I get a Collision Detection error. The initial issue was that the magnetic plate was misaligned and the edge of it collided with those right side screws. I stopped the print and realigned the plate; but ever since then, the bed won't rise past those screws. Ugh. Anyone know what might be wrong, and how it can be fixed?

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?