[Feature request] Footprint/PCB Editor: add quality checks for stencil/solder paste

Description

It would be nice if a check in the Footprint Editor and as well in the PCB Editor DRC could be added to analyse the solder paste aperture / stencil quality.

started discussion in Kicad Forum https://forum.kicad.info/t/custom-drc-for-stencil-aspect-ratio-1-5-area-ration-0-66/65641

https://www.surfacemountprocess.com/a-guide-to-effective-stencil-design.html

All those checks are depending on the chosen stencil thickness.

  • verify Aspect Ratio (Area/Thickness) > 1.5 (or other custom value)
  • verify Area Ratio (Area/Wall) > 0.66 (or other custom value)

image

  • verify chosen Solder Paste Type => Default Ball Rule >= 5 (at least 5 balls in smallest opening of stencil)

image

other potential checks:

  • verify not having drills in paste

KiCad Version 

Application: KiCad Footprint Editor x64 on x64

Version: 9.0.6, release build

Libraries:
	wxWidgets 3.2.8
	FreeType 2.13.3
	HarfBuzz 10.2.0
	FontConfig 2.15.0
	libcurl/8.13.0-DEV Schannel zlib/1.3.1

Platform: Windows 10 (build 19045), 64-bit edition, 64 bit, Little endian, wxMSW
OpenGL: ATI Technologies Inc., AMD Radeon(TM) 780M, 4.6.0 Compatibility Profile Context 24.30.40.12.250818

Build Info:
	Date: Oct 30 2025 19:36:12
	wxWidgets: 3.2.8 (wchar_t,wx containers)
	Boost: 1.88.0
	OCC: 7.9.1
	Curl: 8.13.0-DEV
	ngspice: 45.2
	Compiler: Visual C++ 1944 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)