Frame for Lithophane 80/120/180mm

Simple frame to insert a lithophane (80x80, 120x120 or 180x180 mm) of 3 mm thickness and hang it into a window. 

Just create your own lithophane (for example here: https://3dp.rocks/lithophane/ ) and insert into the frame, it might need a bit glue depending on the precision of your print..

for parametric version see:  https://www.prusaprinters.org/prints/127778-parametric-frame-for-lithophane