thingiverse
The "Kartenbox" - in English probably best translated with "card box" - is a little box with a lid for putting playing cards in it. The inner measures are 65 x 90 x 50 mm (width x height x depth), so it may fit for the most common playing cards out there. There are two little noses on the box, snapping into two holes in the lid, so the lid can hold by these.
I designed two 3D models (seperatly for the box and the lid) in Shapr3D (the files are also included here), spliced them with Cura and let them print with my Ultimaker 2+. A brim or supports are not necessary for both models.
Printing time for both pieces successively was all in all about four hours.
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
This STL file is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
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Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.