Prime Tower Very Very Buggy (puts it off the plate, floating layers) #1437

New Issue

MrUnknownDE · 2026-04-05T17:45:54+02:00

MrUnknownDE commented

2026-04-05 17:45:54 +02:00

Originally created by @ETx13 on 12/3/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1 and 2.3.2

Operating System (OS)

Windows

OS Version

11

Additional system information

No response

Printer

Qidi Q1 Pro

How to reproduce

Add model, add embossed text, change filament of embossed test, make sure prime tower is enabled and no sparse layers is enabled.

Actual results

At first, the prime tower is played outside my build plate. Then if I use a sparse layer, it starts building the tower with the original filament color (even though there's only 1 color change), and then prints the rest with a huge z gap from the plate.

This also happened on a different model where the second color layer was actually quite tall and you can see at the end of the print, the prime tower sparse layer prints one last layer at the very top above nothing. Clearly this is broken.

Expected results

1 layer on the bottom since I'm only using 2 colors (1 color change).

Project file & Debug log uploads

Floating Sparse Layer.zip

Checklist of files to include

Log file
Project file

Anything else?

*Originally created by @ETx13 on 12/3/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1 and 2.3.2 ### Operating System (OS) Windows ### OS Version 11 ### Additional system information _No response_ ### Printer Qidi Q1 Pro ### How to reproduce Add model, add embossed text, change filament of embossed test, make sure prime tower is enabled and no sparse layers is enabled. ### Actual results At first, the prime tower is played outside my build plate. Then if I use a sparse layer, it starts building the tower with the original filament color (even though there's only 1 color change), and then prints the rest with a huge z gap from the plate. This also happened on a different model where the second color layer was actually quite tall and you can see at the end of the print, the prime tower sparse layer prints one last layer at the very top above nothing. Clearly this is broken. ### Expected results 1 layer on the bottom since I'm only using 2 colors (1 color change). ### Project file & Debug log uploads [Floating Sparse Layer.zip](https://github.com/user-attachments/files/23892997/Floating.Sparse.Layer.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? <img width="1479" height="418" alt="Image" src="https://github.com/user-attachments/assets/3b360b51-e078-4272-95ad-8665605597df" />

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Reference: github/OrcaSlicer#1437