Prusa3D Forum - Recent Topics

Prusa MK3S Enclosure with Klipper, Air-Quality Sensors, and Nozzle Clogging Detection

jungoari — Thu, 07 May 2026 17:18:11 +0000

Hello everyone,

I’d like to share my ongoing project: Prusa Enclosure V1.0.

This project began as a custom enclosure and control-system modification for a Prusa MK3S, but it evolved into an experimental monitoring platform for sensor-based nozzle clogging detection.

Project overview:

Base printer: Prusa MK3S
Control direction: Klipper + Raspberry Pi
Controller conversion: SKR Mini E3 V3.0
Enclosure: custom two-level structure with a lower Printing Room and upper Filament Room
Filtration: closed-loop HEPA + activated carbon
Sensors:
PMS7003 for PM1.0 / PM2.5 / PM10
SGP30 for TVOC / eCO2
DHT22 for temperature and humidity
Data collection: 1 Hz synchronized sensor logging
Research direction: multivariate time-series based nozzle clogging detection

The motivation was that nozzle clogging can happen while the printer motion still looks normal. Camera-based monitoring is helpful, but it can be affected by lighting, occlusion, camera angle, and enclosure conditions. I wanted to explore whether air-quality and environmental signals could provide an earlier warning.

In the paper-backed experiment, the detector achieved:

Accuracy: 0.951085
Precision: 0.946218
Recall: 0.999913
F1-score: 0.972325
ROC AUC: 0.975934
Early warning lead time: 472 seconds

The result should be interpreted carefully: the clogging labels are based on a TVOC_diff persistence rule, and some normal samples were classified as clogging. So I see this as a conservative early-warning prototype rather than a complete production-ready detector.

GitHub repository:
https://github.com/Jungoari/Prusa-Enclosure

I would appreciate any feedback on the enclosure design, filtration structure, sensor placement, Klipper configuration direction, or failure detection approach.

MK4 Firmware

Jim Hart — Thu, 07 May 2026 15:51:24 +0000

I have just come back to my MK4 after a long spell away. The firmware is 3.12.2. I updated the Slicer to the latest version which seems to be 2.9.4. Now the code produced from the Slicer is ' .bgcode' which my MK4 does not open. Looking at old SD cards the code is all''.gcode'

What do I have to do now.

I did look at how to update the printer Firmware but it is talking about a USB which I do not have - just a SD card slot. As effectively a beginner again I am lost Some help would be much appreciated

Jim Hart

Hotend Lüfter Fehler

MATTERRA — Thu, 07 May 2026 14:14:57 +0000

Hi!
Ich habe eine Core One L und er hat vor zwei Tagen während des druckens aufgehört. Fehlermeldung: Hotend Lüfter dreht nicht.
Das ist aber nicht der Fall, er dreht. Keine Hindernisse, kein Dreck, keine Beschädigung des Kabels. Bei "Kalibrierung und Tests" kommt auch ein X, also fehlerhaft. Er dreht aber, erst sehr schnell, nach 2 Sekunden langsamer. Neueste Firmware ist drauf. Neu gestartet, Lüfter ausgebaut, eingebaut und trotzdem Fehlermeldung!

Hat wer eine Ahnung?

INDX with cereal dryboxes

jgorniak — Thu, 07 May 2026 13:47:34 +0000

I keep all of my filament in individual cereal box dryboxes and successfully use the MMU3 with them on my MK4S. Footprint concerns aside, is it feasible to arrange 4 boxes on each side of the Core One+ feeding an 8 tool INDX system? I'm primarily concerned about the route and angles of filament going from the dryboxes into the printer. Seems like a lot of PTFE tubing to traverse.

Filament clogging keeps after updating software

Rob T4472 — Thu, 07 May 2026 12:43:04 +0000

I upgraded my MK3s to 3.9 last year and all had been working fine until the more recent slicer & firmware updates where the filament now does its little retract dance at the end of the print. The filament now jams at the start of a new print and needs to be unloaded and cut before being reloaded from where it will print correctly until the next new print.

When it jams , the end of the extracted piece of filament is rougher, distorted and a fractionally thicker where it has melted which is why I assume it causes it to jam, and why a clean cut end doesn't have a problem.

So is there an update or an option to correct this because having to unload and reload the filament every time I want to print something is a pain.

Cheers

"Křivý" tisk?

ferus — Thu, 07 May 2026 11:24:45 +0000

Zdravím, mám dotaz ohledně tisku s PLA:

Tisknu 16 ks identických žetonů v jedné várce a některé se vytisknou správně, jiné jsou "křivé". Od určité výšky jdou ty vrstvy trochu bokem. Navíc poslední (černá) vrstva je taky trochu mimo. Přikládám 2 obrázky, doufám, že z nich bude jasné, o jakou chybu se jedná.

Zajímavé je, že ty špatně vytištěné kusy jsou vždy na tom stejném místě. Například žeton v pravém horním rohu se vždy vytiskne křivý.

V čem může být problém?

Předem děkuji.

Prusa Slicer Pyhsical Printer and UN/PW

RCarnaroli — Thu, 07 May 2026 01:12:36 +0000

So I just got my C1L and I noticed every time I opened P Slicer and went to view the printer, I had to re-enter the UN/PW in whatever browser it's spawning. Iplayed around a little and looked in the forums. I didn't find exactly my issue. So in case anyone else comes across this, I fixed it by putting the UN and PW in the URL in Slicer. So maker:longrandompassword@the_ip_on_your_network. I left the username and password in the config too. But I think it's not using them.

6.4.1 Firmware quirk

JH — Wed, 06 May 2026 22:23:00 +0000

I've noticed that if I stop a print, the head moves away and crashes into the left side. Upon starting a new print after the stop event the head attempts to home being already against the side and stresses the motor/belts. I think it would be nice if a print is stopped/ended the head would park and stop in a place that would cause mechanical stresses if a new print is started with reset or powering off the machine first

Metallic Screech/Rattle with travel moves

Jason3D — Wed, 06 May 2026 19:35:14 +0000

So my Core One L is making a metallic screech/rattle noise, it only appears when doing travel moves. I've redone belt Tension, input shapers and phase stepping, but no luck unfortunately. Does anyone have ideas on what to try?