Butterfly Collar Support for Shirts

If your dry cleaners don't use a little plastic collar support to keep your shirt collar spreads nice and like new, you can print your own at home in a matter of minutes. These supports go on while the shirt is on the hangar.

The model prints in just two layers when using a 0.20mm layer height. I recommend PETG. Slide the printed collar support under the collar with the curved side facing up, as shown below, and fold the collar back down.

Combine this with collar stays like the ones by @GCV3D to maintain a nice sharp collar.