Wifi Router is on one end of the apartment. Office is on other side. With coronavirus making us all WFH it was time to improve wireless connection with a reflector that wasn't as ugly as (but not performant as) my earlier cardboard corner reflector.

Prusa

I3 MK3S

Yes

Doesn't Matter

0.3mm

5%

Raft if making in ABS.

Print and cover the inner curved face with metal. I used Aluminum tape. Place behind wireless router if it's near a corner, and it will improve the quality of the signal. Scale as needed. A cutout was made for a bookshelf. I made it a little too high and therefore the reflector sits a little low relative to the router, but it gets the job done without being too intrusive.

Add metal to the curved face. Aluminum tape, aluminum foil and tape, anything conductive. Use command strips or whatever to affix to corner.

OpenSCAD was used, the file is included.
Created 2-D cutout of roughly what I wanted, then did a linear extrude. I also made a cylindrical cutout to save on material and weight.
Two sections were put together for my bookshelf.