This may be useful for folks:
context is generating tool outlines for foam layout, but it also has support for the Gridfinity system:
the site supports both Letter and A4 sheets, and is not limited to that size — the sheet of paper simply needs to be included in the photo, tools are not limited to that space.
Alternative for folks not patient enough for:
Looks pretty cool!
Based on my general experiences tracing images to svg, AI improvements have actually been pretty awesome over the past ~1 year (EG: not just marketing hype)
It is a bit weird that ~all of the links in the footer are broken/404 on tool trace and their other site rocket brackets.
Hopefully that’s just the founders getting their feet under them 
Yeah, I actually e-mailed them about that (the broken links).
We’ll have to see how it plays out — I actually started a Github repo for “Gridfinity/2”, which will be a re-mix on a 21mm grid… (and which also can make use of the 100mm blocks which are used for Carbide 3D stuff) — no real work yet (still trying to wrap my mind around a re-write of my current project), but I’m hopeful it will be useful to folks.