Picture frame 5.7" x 8" x 6mm
thingiverse
Made a picture frame for a buddy on shapr3d for a laser cut wood panel he made 5.7" x 8" x 6mm thick might work for a lithopane? No step file because not paying $299 a yr to be able to export step files in shapr3d..Too big for an ender 3, you might be able to split the model?
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