Variable Font with Corner Component

Hi, I’m trying to export a variable font from Glyphs 3. The font has Corner Components, which are set up like described in the tutorial. Both the Corner Components, as well as the base Glyphs are compatible. Still I’m getting this error:

How can I solve this?

What version of Glyphs do you have?

And can you show screenshots from the ‘b’ masters?

I’m working with 3.0.3 (3089).
This is the b in all masters:


The corner component is set up like this in all masters:

I don’t think it is caused by the corner.

Can you show the same for the bowl glyph?

Sure. The bowl glyph seems compatible too

Looks good. Can you send me the file?

The problem is with the corner component after all. The top “_corner” is slightly to large and crates this little spike that produces a self intersection.

move those two point one units to the right or make the stem in the ‘b’ one unit wider.

Ah I see! Thanks @GeorgSeifert

Hi!
I think I have the exact same issue, but a bit more complicated as I use my corners as an Italic Serif for my variable font. The thing is that I don’t find the way to make the corner ‘too large’.
Perhaps can you help me on this ?
Can I send you directly my glyphs file in case you can help and have some time for it (it’s a bit confidential)?
Thanks a lot!

Can you send the file?

You should use _cap components. They are intended for this.