I printed this with PETG for flexibility with 0.20mm QUALITY settings. No supports needed. Infill settings don't really matter since this is so thin that they would not apply anyway besides in some very small corners.
Note, the photo of the back side is from a slightly older version without the rounded corners.
Update: Small design fixes at the entry point of the card.
Update: Added colored text with my name and phone number. You may want to change the name and phone number before printing or use the version without the text. ;)
The author remixed this model.