===Update=== Stand added ===Update=== 

Instax Mini Magnetic Fridge Frames, with an overall thickness of only 3mm.

I recomend the textured sheet for a shiny surface finish.

The frames can be equipped with magnets (6mm x 3mm x 1.5mm) to attach them to whiteboards, refrigerators, and other suitable surfaces.

Check them out on Amazon.

Assembly might be a bit tricky, depending on the filament and the tolerances of the magnets. Magnets can stick out of their pockets without any issues; the Instax photo and the frame will keep them in place. No glue needed.

If you can't get the magnets into the carrier, carefully heat up that area of the carrier and push the magnet into it. Never heat up the magnet; it will not work anymore!

Assembly:

The frames themselves can be assembled by sliding the lower edge of the carrier into the frame [3] and then starting to push the sides in place [4]. The top edge is a bit more demanding... You need to bend the frame a bit [5/6] while pushing it together.

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Maybe I will add more designs; my wife still has some ideas. If you want something specific, let me know!