Matching a Filet with a Chamfered Edge

I use Shapr3D to create objects to be printed on a 3D printer. My current challenge is to create an insert for a box which was designed by someone else. The bottom of the box has a chamfer where the bottom meets the sides but is also rounded (has a filet) at the corners. My first version of the model worried first about matching the chamfer, so I wasn’t able to move it into the corner. But the chamfer matched and the side-to-side dimension was good. So I printed a set of filet radius gages and measured the filet. I came up with 20. I applied that to my shape (with the existing chamfer) and re-exported and printed enough to test fit it. But it didn’t fit. I thought it was the gages so I made my own set and printed them and then measured but the two sets of gages match. So why am I getting an under rotated filet (sharper corner) than what I ask it to be? How can I fix this to be the correct radius? Would it work better if I applied the radius and then the chamfer?

–Chip/N1MIE

Hi Chip, Welcome to the Shapr3D community!
Screenshots would be useful here. :slight_smile: Show us what your work looks like before and after you apply your fillet.

My guess is the fillet stops because it gets to a different face? For this picture I put a little step in the face, and the fillet does not complete a full 90°

I think it would be better to do the 20 mm fillets before the little champfers.

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