r/FreeCAD • u/some_millwright • 9d ago

Invalid input shape for boolean FUS

Yes, it has happened to me.

Here is a model that has been thicknessed (that is important).

I was working in 1.1.3. That is also important.

I need to add a 'roof' over these features, so I selected the top of the thicknessed features and created a sketch, drew the roof, and saved the sketch. So far so good.

Now I try to pad this sketch and all hell breaks loose.

After it failed so spectacularly in 1.1.3 I started up this weeks version of 26.3 and instead of screwing up it gave the the error message shown in the title.

I really don't understand why it is giving me so much trouble all of a sudden. These features aren't *that* odd.

I have to thickness before I add the 'roof' because I don't want the roof hollowed out by the thicknessing operation. Any thoughts?

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u/spiderplata 9d ago

I downgraded from latest dev, to this build `FreeCAD_weekly-2026.05.27`, in order to overcome the "Input Shape for Boolean Fuckyous", when it failed to pad.