I am always looking for my one set of collard stays. In some cases, I can't use them because they are too long. I remade my set of metal collard stays into these ones and made them 3 different lengths and 2 different thicknesses.
The thickness of 0.7 mm is sturdy enough, but if you really want your collard to look tight, you can use the 1.4 mm thickness too.
Sidenote:
I always take them out before washing. However, if you would like to leave them inside of the shirt when washing, print them in ABS or ASA.
The author marked this model as their own original creation.