This model is Parametric. You therefore can alter the inner dimensions of length, height, thickness, and corner radius in the “Customise” feature.

If using the Customise feature:

• First, take the dimensions of your playing cards, be it poker, bridge, uno, or whatever
• The values should be inputted into the corresponding fields, with the corner radius as 2.75mm as default.
• Add 0.5mm to the bottom length value
• Add 0.5mm to the side height value
• Add 1mm to the total thickness
• In the rare event that the hinge does not fully generate, reduce the Inner Fillet Radius parameter. A reply to a comment made by @user_2312499019 explains this well.
• Export as .3mf, with your printer model
• Open the file in Bambu Studio
• For best effect, set layer height to 0.16mm
• Use the “Split to Object” feature to separate the base from the lid
• Click the “Paint support” feature, click the “Fill” button in the drop down, tick the “On overhangs only” box
• Paint the support onto the underside of the overhanging flap on the lid, which is also conveniently already coloured by yellow and purple squares by Bambu Studio
• Tick “Enable Support” in settings
• Tick “On build plate only” under Support settings
• Optionally change Print sequence to “By object” under section “Others”, then rearrange the objects. This increases print quality

If printing the Print Profiles:

• First take the dimensions of your Playing Cards. These print profiles fit a standard 54 deck of cards, or for the UNO deck, 104 / 112 cards. The two most common sizes for playing cards include:
  • Poker Size 63.5 x 88.9 mm / 2.5 x 3.5 in
  • Bridge Size 57.15 x 88.9 mm / 2.25 x3.5 in
• Select the corresponding print profile for printing

How to assemble the Filament Hinge:

• For simplest assembly, cut a piece of 1.75 diameter filament to length 20mm / 2cm
• Insert into the hole for the hinge. You’re done.

For best effect, optionally treating the ends of the Filament Hinge:

I have also included the instructions below in the last few photos above. This method is a shortened and adapted version of  SteveS42's Filament Hinge Tutorial (CC BY-NC-SA 4.0)

I take no responsibility for any harm caused when carrying out these steps. Please take care when handling hot surfaces and sharp tools.

Tools needed:

 - Paint scraper / Putty knife / Snap-off utility knife

 - Butane torch

 - Pliers (optional)

 - 1.75mm filament

 - Scissors

STEP 1: Cut a piece of (preferably durable) filament to around 4cm long.

STEP 2: Heat the flat metal surface of a paint scraper / putty knife / snap-off utility knife with a butane torch for about 4 seconds. (I have not tried using a lighter, though if used would probably take very long to heat.) - Take Care when handling hot surfaces and sharp tools

STEP 3: Lightly push on the end of the filament against the hot surface to form a slight “mushroom” at the end.

STEP 4: Push the filament through the hinge hole, then pull out the other end with pliers if tight, until the treated end sits flush against the hinge.

STEP 5: Cut off excess filament leaving around 2mm left.

STEP 6: Once again heat the edge of the metal surface and press against the remaining end until it also sits flush against the hinge.

Feedback is always welcome - please leave it in the comments!

This took a lot of time and effort, please give it a like!

Happy printing!