This is a picture frame for A5 (148 mm x 210 mm) pictures chopped in four parts to fit the build plate.
To stick the parts together use a toothpick and cut it in about 1,5 cm long pieces.
To hold the picture in place i use an A5 piece of Plexiglas and cardboard.
You need to print two of each.
No support needed if printed standing.
This was designed in Tinkercad