Prusa3D Forum - Recent Topics

Has anyone modified the core one firmware to allow 60c chamber temps as before?

Plastic Golem — Fri, 05 Jun 2026 23:11:36 +0000

As in the title, I would like to have a 60c chamber again as the current new hard limit of 55c is causing print failures during engineering prints.

at 55c the chamber vent fans now kick on at 100% and this causes a large cold air draft which leads to warping and layer shift in the case of long prints.

I believe 6.4.0 was the last update before they downgraded the chamber temps, but I wanted to ask first in case anyone has edited one of the latest to keep the QoL updates but not apply the new chamber temperature limit

Thank you!

Q - Internal support ideas for long horizontal tube (removal of support, PETG)

AndrewVanis — Fri, 05 Jun 2026 21:01:36 +0000

Question - Internal support ideas for long horizontal tube (removal of support, PETG)

Project includes a horizontal tube with an interior diameter of 5cm (1/2") and about 280mm (11") long(deep?).

Even on prototypes of 1/4 the length, removing the internal support is problematic. Printing in PETG since it will carry gasoline (petrol).

Ideas on how to support the interior of the tube as it is printed?

I have considered making the internal opening a triangle or a pentagon so it ends in a ^ top so it may not need support and though functional it would be nice to have a round cross section.

Thoughts?

Printing with engineering filament on Prusa XL without enclosure?

Enrico Michael — Fri, 05 Jun 2026 17:00:33 +0000

I plan on purchasing Polymaker Fiberon PET-CF17. Has anyone tried printing this filament on a Prusa XL without an enclosure?

I have not had any success printing medium to large objects with Sunlu Easy-PA Nylon, even though it is advertised as a low-warping filament. Every time the print reaches a certain height, I suspect it starts to warp, which causes an ‘Extruder Motor Not Spinning’ error to appear. I believe this happens because the warped print interferes with the nozzle, preventing proper extrusion.

Dots left on bed during probe prior to print

Staze — Fri, 05 Jun 2026 16:19:04 +0000

I see a few people reporting this, but not recently. Anyone have a good fix for dots left on print bed (that then end up embedded in the print) during probing prior to printing?

Thanks!

Prusa Core One - Belt Resonance Off The Scale

Morganator — Fri, 05 Jun 2026 15:46:28 +0000

I have recently been experiencing issues with prints on my Prusa Core One. Small details it used to handle just fine would come out broken. Keeping an eye on it, I noticed it appeared to be pushing bits down, bending details as it printed. As I was trying to troubleshoot this, I checked the belt tension. It turns out for my belts, the top belt resonates in the high 80's, while the lower one is set at the mid 70's. The manual tension setting told me this was far too low, and the gantry must be unaligned. The problem is, it isn't. Both sides sit perfectly flush. Any help with this matter would be greatly appreciated.

Prusa Storage: How to delete easy print files

docsascha — Fri, 05 Jun 2026 14:02:47 +0000

My Prusa storage is 71% full mostly with easy print files.

I delete all unnecessary connect files but can not find a way to delete easy print files

Any tipps?

Belt Twist at home position

ugabuga — Fri, 05 Jun 2026 12:34:43 +0000

Hi folks,

After completing the MK4S-to-Core One Plus conversion and reaching the (somewhat confusing) belt tensioning stage of the setup, I noticed that the lower belt has a visible twist when the extruder is at its home position.

I've already completed a number of prints on the machine, and there don't appear to be any obvious issues as a result. However, I wanted to check with the community to see whether anyone else has noticed this or experienced any problems related to it.

The twist is fairly minor—I'd estimate about a 30° corkscrew twist in the belt. It straightens out as the extruder moves toward the center of the X/Y travel. My assumption is that the belt may have developed some "memory" from the way it was packaged, but visually it doesn't seem to be causing any issues.

Has anyone seen this before? Do you think it's worth ordering a replacement belt, or is a small amount of twist like this considered normal?

Thanks for your time and any advice you can provide.

Struggling to get this printed

Franko — Fri, 05 Jun 2026 12:32:38 +0000

Need some help with this if possible please?

Created this perforated pot and it all seems to slice ok but when I try to send it to the printer it says sent but nothing happens.

When I check Prusaconnect it shows that it fails receiving halfway?

I have tried it with adding supports and still the same outcome.

Very grateful for any advice, thanks.

d656254c-screenshot-1.png

"only g-code for fdm printer can be uploaded"

Bas — Fri, 05 Jun 2026 11:07:57 +0000

I have a Prusa MK3S with an attached Raspberry Pi Zero 2 W running PrusaLink. In Prusaslicer, I can slice a model but when I click the Send to Printer button, PrusaSlicer fives this error:

HTTP 415: Unsupported Media Type
Only G-Code for FDM printer can be uploaded.

I'm using the Original Prusa i3 MK3S & MK3S+ preset, so it's a mystery to me why it thinks it's not GCode for an FDM printer. In fact, if I export the Gcode to a file, upload it in the PrusaLink browser page, it uploads and prints just fine.
I've attached the offending gcode but it happens with every model I try to slice and print. I'm using PrusaSlicer 2.9.4 on Ubuntu. Here's the PrusaLink version info:

API 2.0.0
Firmware 3.14.1-8237
Server 0.8.1
SDK 0.8.1
Frontend 3.12.0

Any idea what could be happening?

What happend with firmware 6.5.6?

docsascha — Fri, 05 Jun 2026 10:57:28 +0000

Got an Forum Mail that Firmware 6.5.6 is released and suddenly the Forum post was visibly for some time and then it was erased.

Die anyone know more ?