V9 Add a different width segment on straight track

Layout
1

I want to terminate a transmission line into an 0402 footprint, so need to step down the track width at the end of the line. So I end the line with a double-click, start routing from the 0402 with the new smaller track width, but once I connect the segments the entire track changes to the new width and the segments have auto-merged :frowning: In both cases I’m selecting predefined track widths rather than use netclass values.

Is this a bug, or a feature I can’t find out how to turn off?
Simple test project attached…
widthtest.zip (9.4 KB)

Application: KiCad x64 on x64
Version: 9.0.0, 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 11 (build 26100), 64-bit edition, 64 bit, Little endian, wxMSW
Build Info:
Date: Feb 19 2025 17:46:53
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_GB
Enc: UTF-8
Num: 1,234.5
Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)

2

Do you have this button selected? It uses the existing track width rather than a specified width.

image

3

Just tried it, makes no difference.

In any case, that should only take effect when routing from the end of an existing track. I deliberately ended the track and started a fresh route with the new width from the pad to the track to prevent this.

It’s not the widths per se, but the combining of segments that’s a pain, otherwise I could just edit the final segment and change the track width.

[edit: typo]

4

I can confirm that this is happening, here’s a video:

1 Like
5

Yep that’s a regression (bug). We’ll look to get that fixed.

3 Likes
6

For info - I found a workaround by locking the last segment of the track before routing to it.

1 Like
7

Thanks. This seems to be fixed in nightly, is there a ticket we can watch to see when this gets into 9.x ?