Collar Keeper

Place this under a collar to give it rigidity and prevent flopiness. I've included a large and small size but size can easily be tailored for a perfect fit using the f3d file provided (I recommend shortening the tips of the fit point spline in the first sketch).  I designed this because comparable products cost a ridiculous amount to purchase.

I recommend printing in PLA as it is a little too flexible for my taste in PETG. Layer height to your liking. I printed on a .6 nozzle with .3 layer height.