M5 Screw with min 15mm head (I used old Ikea high sleeper screws)
You need to pause the print at a certain height. Google for "pause at height" and add it to your post processing option in cura / slic3r. You should do test prints and test your real dimensions. I used a 0.6mm nozzle for this print and had to widen the sizes.
If the print is finished, clean the hole and insert the screw. It should slightly grip into the material. Use it to center the washer and fix it with superglue. Make sure your screw is tight enough and won't wiggle or turn around, while swinging.
For the keychain ring I used shrink tubing and superglue to keep it in place.
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