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A lantern with 3 to 12 flat sides, each showing a photo. Add one to six photos and they fill the faces in order, repeating to fill every side. Choose the corner-to-corner diameter and the height, add a raised frame around each photo, and a base plate with an LED hole if you want one.
The inside faces stay flat with the relief on the outside, and it prints as one piece. It is free with an account: register free, then build, preview and download, with a few downloads a day; Supporters download without a daily limit.
From 3 to 12. More sides make it rounder but give each photo a narrower face.
Yes, up to six different photos. With fewer photos than sides, they repeat in order.
Stand it over a cool LED or a battery tea light, or add a base plate with an LED hole in the generator.
Use 100 % infill, a 0.10 mm layer height (0.08 mm for the finest detail), a slow speed of about 30 to 40 mm/s and the fan at 100 %. Any gap in the infill lets light leak through unevenly. The full table is in the guide.