Here are a couple of worm molds that I made. I use these to recycle old plastic lures. If you print with PLA the lure plastic comes out of the mold easily. The first time that I ever tried this I used PETG but the lure plastic stuck to the PETG so bad that I ended up throwing away the mold. PLA works great though, just heat up the old lures in the microwave with a Pyrex measuring cup and pour into your molds. Make sure to use common sense and be safe. Heating these lures causes gasses that you do not want to inhale so I would suggest in wearing an air filter.