Multiple Tab-and-Slot Joint : Improvement of the Rotational Stiffness

I have sized the tab slots to be mm wider that the tabs themselves to allow an easier fit and make room for some glue I am using the Fusion

Can't seem to apply tab and slot joint between the two Base-flanges I don't understand what the problem is

tab slot Adding Slot Joints: Designing for laser cutting in Onshape, part 8 Designing for Tab and

tab and slot weld 1 A box girder prototype on which we introduce the combination of snap-fit joints with shear-resistant tab-and-slot joints and test the