Artist Trading Card (ATC) Frames
thingiverse
This is a pair of stick on frames for a standard sized ATC (2.5"x3.5"). Also included is a printable ATC. At 2mm thick they are designed to attach to a 2mm back to keep the whole project 4mm deep. You can print just the frame of your choice and glue it to an ATC from your normal supplier, or you can print the frame of your choice and the standard ATC and glue them together. Also available at https://www.thingiverse.com/thing:3771466 are a version of these that snap together with no need to be glued.
With this file you will be able to print Artist Trading Card (ATC) Frames with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Artist Trading Card (ATC) Frames.