Assembly and first prints troubleshooting - Prusa3D Forum

Not printed for a while, prints awful, is it wet filament?

PaulB — Sun, 01 Mar 2026 18:58:02 +0000

Hi,

I've been too busy to print for the past few months, tried today, and the prints are awful. Any ideas, is it likely caused by wet filament?

Thanks in advance.

Paul

Live Z Adjustment test is perfect but prints are garbage

WillDeed — Mon, 02 Feb 2026 23:15:09 +0000

I've had the MINI+ for a while now, so this isn't my first print, but my prints are turning out garbage now and I don't know how to fix it. Things I've tried:

Update the firmware to 6.4.0 11974

Update the slicer to 2.9.4

Replace the nozzle

REALLY clean the build plate (hot water + soap + scrubbing + paper towel)

Live adjust Z (dialed in perfectly)

Bed level test (Specifically the MINI 3mf file)

Left: 0
Right: 100
Front: 0
Rear: 0

Left: 10
Right: 80
Front: 50
Rear: 60

Live Z Adjust is dialed in perfectly at 1.775

Any suggestions?

Cant print anything

Jullicca — Thu, 29 Jan 2026 11:47:14 +0000

IMG_0597

i cant print anything, the print starts to geto of every thime seems like the nozzle is going too close to the last line? Help!

Buenas tardes. Me está dando problemas la impresora. Me indica problemas en el cableado del termistol, lo he cambiado completamente y me sigue dando el mismo problema. Escaneo el código QR y me indica error desconocido. Me puede ayudar alguien? Mu...

JOSE MARIA REYES PRIETO — Fri, 23 Jan 2026 12:21:05 +0000

Mesh level fails on mini

Grandpa Joe — Sat, 10 Jan 2026 21:52:36 +0000

Prints have been going well, but today - When i run mesh bed leveling on my Mini, the nozzle is smashing into the print bed, forcing whole thing down several mm.

How do I get it to run?

Beginner: issue with PTEG

kaelig micka — Sat, 06 Dec 2025 08:56:40 +0000

Hello,

I am print with a Prusa Mini plus since one Month without issues.

Since last week, I have issues

Hence, I have stop my printer. Check the bed, make the autodiagnosis, check the pinda height versus the hotbend.

I have also change my Prusaslicer parameters. I move from "Generic PTEG" 235°/85° to "Prusament PTEG" with 230°C/80°C for the first layer and 240°C/80°C for the other layers.

I have started with small print without issues. Hence, I have decided to print a medium model. The first layers were good, but at one moment, a new print issue.

I use "Amazon Basics PTEG".

Thank you for your help in order to solve the two issues. I am a beginner, hence I do not know how to solve them.

Mesh Bed Levelling: What amount of variance is acceptable?

smooth_electronics — Wed, 19 Nov 2025 20:32:52 +0000

Hi All! I am having first layer issues so I have been using OctoPrint's Mesh Bed Level Visualizer plugin to measure the MBL variance. I ma following the guides from Prusa but I am still finding it hard to get a good first layer across the entire bed.

Below is my mesh data. Given the scales are supposed to be exaggerated this looks fairly good to me. In reality, a 0.512 mm variance would seem large compared to my typical layer height for printing (0.2 mm).

Is this an acceptable variance the printer can effectively compensate for with auto bed levelling? I'd like to know if I am anywhere in the ball park before going deeper (taking the printer apart to look for faults).

-0.250	-0.121	-0.367	-0.312	-0.304	-0.285
-0.070	-0.129	-0.187	-0.186	-0.172	-0.159
-0.265	-0.136	-0.007	-0.060	-0.041	-0.022
-0.002	-0.022	-0.042	-0.047	+0.049	+0.145
-0.007	-0.094	-0.180	-0.016	-0.005	+0.006
-0.145	-0.165	-0.317	+0.015	-0.059	+0.038

Jammed extruder gear Again!

jamie wise — Wed, 05 Nov 2025 01:29:11 +0000

Filament stuck inside PTFE tube on Prusa Mini

andrea.cordella — Fri, 10 Oct 2025 14:01:59 +0000

Hello, I have a brand new Prusa Mini and I was trying my very first print. During the print, the object came loose from the bed, so I stopped the print. After that, the printer stopped extruding filament — nothing was coming out of the nozzle.

I tried unloading the filament, but it didn’t move. When I heated the nozzle to 215 °C, a small piece of filament finally came out, but it seems that the filament broke inside the PTFE tube. Now there’s about 25 cm of filament still stuck inside the PTFE tube, from the extruder down to the hotend.

What’s the best way to remove it safely without damaging the tube or the fittings?

Thank you for your help!

Part with heatbed connector is MELTED (help)!

Eco Innovate — Thu, 18 Sep 2025 02:50:24 +0000

Hi everyone,

Super concerned about this on the MINI+. Has anyone experienced a similar issue or knows the root cause? My friends and I (relatively inexperienced) built the printer from the kit, and I'm worried a loose connection of some sort may have locally raised the temperature of this part to the melting point of the part itself. I haven't been operating it since I'm scared of melting reaching the wiring below, and prospect of an electrical fire. What should I do to fix this?