IKEA kitchen plinth, internal corner

After 2 years of being annoyed over my kitchen plinth coming apart in the corners when vacuuming, I finally made the corner piece, IKEA should have made years ago...

This is for an internal corner, fitting all IKEAs extruded plinth profiles, such as Ringhult and Voxtorp. There is also an external corner.

The piece is hollow, so prints in a reasonable time.

This is my first design for 3D print, so comments are welcome