Length Tuner Gives Innacurate/Variable Lengths for same trace

Layout
1

Hi,

The length tuning tool gives different lengths for the same trace depending on which part of the trace you hover over. See the example screenshot. The length tuner reports this trace to be either 65 mm or 62 mm depending which segment you hover over. Other examples are more extreme (not just a couple of mm difference each time).

These traces are connected end-to end but jump layers a couple of times. This is not an isolated example seems to happen frequently, but not for every trace

Surely this is a bug, what is the work-around for this?

image
image2750×858 458 KB

FYI this is Kicad V9

Thanks

2

Which one ?

Can you paste your version info here please, you can get it from KiCad > Help > About KiCad > Copy Version Info
image

3

Check if a nightly or bugfix release of v9 has addressed this. You can also report the issue here:

4

This is a known bug:

1 Like
5

Hi

Application: KiCad PCB Editor x64 on x64

Version: 9.0.1, release build

Libraries:
wxWidgets 3.2.6
FreeType 2.13.3
HarfBuzz 10.2.0
FontConfig 2.15.0
libcurl/8.11.1-DEV Schannel zlib/1.3.1

Platform: Windows 10 (build 19045), 64-bit edition, 64 bit, Little endian, wxMSW
OpenGL: Intel, Intel(R) UHD Graphics, 4.6.0 - Build 26.20.100.7372

Build Info:
Date: Mar 30 2025 01:11:30
wxWidgets: 3.2.6 (wchar_t,wx containers)
Boost: 1.86.0
OCC: 7.8.1
Curl: 8.11.1-DEV
ngspice: 44
Compiler: Visual C++ 1942 without C++ ABI
KICAD_IPC_API=ON

Locale:
Lang: en_AU
Enc: UTF-8
Num: 1,234.5
Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)

6

So it sounds like the length tuning tools are not usable?