Hello everyone, I wanted to share my experience with the U1 after updating to firmware 1.5.0 and see if anyone has experienced something similar. What happened Immediately after updating to firmware 1.5.0, my print quality became noticeably worse. The most obvious issues were: Poor first layer …

[image] furkanyvz: Poor first layer quality Nozzle dragging through the first layer Uneven extrusion pattern Update: V1.5.1 resolves the first-layer issue for most users affected by V1.5.0. If your first layer is still overly squished after updating, you can download a temporary 1.5.2 beta …

Here’s another nail in the coffin for 1.5.1 – I tried to print the dragon and it instantly hit an exception complaining about incompatible nozzle diameters: [image] Just Setting Up My U1 Has anyone else tried to print the dragon after updating firmware? As delivered, and as per the first test p…

Support replied with a solution but I’m not in a position to test it: [image] Just Setting Up My U1 I got a reply from Support: in summary (and reading between the lines) they say the stats for a print file don’t get re-scanned automatically (in 1.5, I presume). They say the error report was cau…

Been suffering from same and worse issues with 1st layer since updating to 1.5. Updating to 1.5.1 fixed nothing, support provided some firmwares that also did nothing. Already did bed leveling, offset calibrations, changed the gcode as per their recommendation and much more. Do they do any testing a…

[image] SNAPPY3: It is very frustrating, support keeps recommending silly things like change the side of the plate, do this calibration again, do that again, etc etc, knowing well that i have already done all that and informed them about it. Sounds like an AI response. [image] SNAPPY3: P…

I can see no reason for not flashing with Paxx firmware. I would suggest doing a full calibration after installing Paxx firmware.

[image] Zoe_M: However, due to the changes introduced in recent updates, these steps have become necessary. I’m still catching up on this thread, but this isn’t great. A new mesh should not be required to have the correct z offset, assuming the last mesh is still valid. Personally, I am relu…

Actually, I think I misread this. Bed level and calibration are required after update. Are they also required with every print? (That would be strange.)

I agree. I strictly use adaptive mesh leveling. This always replaces the last known mesh. I don’t want to try out and guineapig the latest firmwares just to find out my setup doesn’t work anymore.

For what it’s worth, I think I misread Zoe’s post. She seems to just be saying a one-time recalibration is needed after the initial update.

I hope your right, I think I’m gonna sit on my hands at least until PAXX releases his next full/stable release as it all feels alittle rushed atm?

Firmware 1.5.0 - Print Quality Degraded After Update (Improved After Downgrade + Full Recalibration)

U1 Toolchanger U1 Troubleshooting guides

RepairAndTinker July 15, 2026, 4:21pm 37

Why not link to the original post? Now it looks as if you wrote this text

Original post by Zoe M here:

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Firmware 1.5.0 - Print Quality Degraded After Update (Improved After Downgrade + Full Recalibration)

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