The QFN footprint wizard generates invalid footprints

[Rene Poeschl]

The current qfn footprint wizard always centers the pads at the body dimension. This means that either the heel fillet is way too small or the toe fillet is way too large.
I would suggest to add at least a parameter to control the pad center position.
Or upgrade the generator to use ipc calculations.
As an inspiration have a look at the ipc dfn_qfn generator script i created for generating footprints for the official lib. https://github.com/pointhi/kicad-footprint-generator/pull/125

[Seth Hillbrand (sethh)]

Makes sense. I think this makes sense to address along with the rest of the python work during 6

[Rene Poeschl (poeschlr)]

If the plan of @pointhi (hope this is his handle here as well) goes as planned then my qfn (and other footprint generators) should be easily transferred to the footprint wizard. Details about his plan here: https://forum.kicad.info/t/rfc-future-of-footprint-wizard-and-generator/12592 and here: https://github.com/pointhi/kicad-footprint-generator/issues/152#issuecomment-409978763 (plus other comments on the scripting repo)

[nats (nats-1)]

Hello,
I'm in processing of porting my previous QFN Wizard with a lot more features than the new one, and I added the "fillet" handling because it's impossible without it to make arbitrary pad length.

I attached a patch. (I used it today but didn't test it extensively)

[Wayne Stambaugh (stambaughw)]

@nat, I committed you patch to the development branch. Thank you for contribution to KiCad.

[KiCad Janitor (kicad-janitor)]

Fixed in revision 6e77176d7666cfafbea8e939e3631b73ddb99d23
https://git.launchpad.net/kicad/patch/?id=6e77176d7666cfafbea8e939e3631b73ddb99d23