Picture Frame for 10x8cm pictures

This is a small frame for a picture. I designed it to fit a polaroid picture a friend made.
It can handle 12x10cm pictures but will only show 10x8cm.

To keep the picture in place just make a small 12x10cm cardboard-piece and stick it behind the picture.

The lines on the face are because of some warping and underextrusion, but it kind of looks good so i kept it.