I printed 2 of the corners and they look great, starting the other 2 now.

Used PLA and added Rafts and supports, which I usually do not do,
since there are long overhangs on bottom sides and strength is more important than making bottom look-good.

Not sure if one corner will need to be sanded or not , but will be easy to do if needed.

Will not install them until I get the 8"x10" glass.