I designed this to fit on the inside corner of my front entryway covered porch area. I used the metal plates from another single gang enclosure to screw to the 3d printed part and be able to screw the doorbell to the metal piece. The metal pieces are tucked in and mounted to the part. Mounting through the front opening with 2 screws into the corner block.

I first printed this with PLA. Had some cracking when installed but it has been up for 6 months now and been press on a lot. I did print another version with ABS but haven't got around to changing it out.