first layer flow of max flowrate test hardcoded #363

New Issue

MrUnknownDE · 2026-04-05T16:20:16+02:00

MrUnknownDE commented

2026-04-05 16:20:16 +02:00

Originally created by @etgocode on 3/10/2026

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1

Operating System (OS)

Windows

OS Version

11

Additional system information

No response

Printer

Snapmaker U1

How to reproduce

Go to "Calibration" -> "Max Flowrate"
Enter Values i.e. for tpu:
- Start volumetric speed: 1.6
- End volumetric speed: 2.3
- Step: 0.2
Look at flowrate of the first layer of the generated gcode

Actual results

The Flow of the first layer / brim is always around 5 even if it exceeds the end volumetric speed that was put in.

This is also true if the start volumetric speed is much greater than 5 (i.e. 20):

Expected results

The first layer and brim should use the value of "start volumetric speed".

If the value is higher using ~5 for the first layer could maybe be considered a safety feature to make sure the test adheres to the build plate but if it is lower the exact opposite will be the case.

Project file & Debug log uploads

n/a

Checklist of files to include

Log file
Project file

Anything else?

I am not sure if there is an error passing the flow value to the first layer around here or if the problem is related to there being a brim like in #11853 . Using #10641 in the nightly build I was not able to adjust the flow of the brim / first layer

*Originally created by @etgocode on 3/10/2026* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1 ### Operating System (OS) Windows ### OS Version 11 ### Additional system information _No response_ ### Printer Snapmaker U1 ### How to reproduce 1. Go to "Calibration" -> "Max Flowrate" 2. Enter Values i.e. for tpu: - Start volumetric speed: 1.6 - End volumetric speed: 2.3 - Step: 0.2 3. Look at flowrate of the first layer of the generated gcode ### Actual results The Flow of the first layer / brim is always around 5 even if it exceeds the end volumetric speed that was put in. <img width="1716" height="765" alt="Image" src="https://github.com/user-attachments/assets/709dce6c-c20c-401f-935a-6a254971c4de" /> <img width="1475" height="615" alt="Image" src="https://github.com/user-attachments/assets/21da2e7e-2cf9-4b5f-a31d-d0209247fc4c" /> This is also true if the start volumetric speed is much greater than 5 (i.e. 20): <img width="1062" height="635" alt="Image" src="https://github.com/user-attachments/assets/871acbc8-70b1-42f8-a393-b453b4332528" /> ### Expected results The first layer and brim should use the value of "start volumetric speed". If the value is higher using ~5 for the first layer could maybe be considered a safety feature to make sure the test adheres to the build plate but if it is lower the exact opposite will be the case. ### Project file & Debug log uploads n/a ### Checklist of files to include - [ ] Log file - [ ] Project file ### Anything else? I am not sure if there is an error passing the flow value to the first layer around [here](https://github.com/OrcaSlicer/OrcaSlicer/blob/fbe2aeaa2e50e7c55be63c2b0959d7cd678f11fe/src/slic3r/Utils/CalibUtils.cpp#L1193) or if the problem is related to there being a brim like in [#11853 ](https://github.com/OrcaSlicer/OrcaSlicer/issues/11853). Using [#10641](https://github.com/OrcaSlicer/OrcaSlicer/pull/10641) in the nightly build I was **not** able to adjust the flow of the brim / first layer

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Reference: github/OrcaSlicer#363