I had the same problem as one of the other commentors. Once printed, the frame was slightly too large to fit on top of the X1C.
I removed 1.5mm from each of the rear pieces between the last vent hole and the corner.
The glass still fits easily on top.
(The program I used left some artifacts on the model where I made the modification. It's only cosmetic and is near the back and I don't have the knowledge/skill to fix it.)
The author remixed this model.