About this 3D model
This is a case for Vintage Holmes Stereoscope - https://www.myminifactory.com/object/3d-print-159381. The case has also space for approximately 100 stereo photographs. Although the images show "2020 3D", the text in the stl is only "3D". The box is printed in 2 parts and the lid in 3 parts. The parts are glued together with pegs (altogether 7) and epoxy, and some filler may be necessary. This is to avoid need for supports. Additional material needed are two hinges, a latch and some 6 mm wide textile band. See photos.