I remixed a fully printable butterfly/balisong trainer knife so that it can be printed with no issue in terms of scaling and should be as easy as print out and ready to use.

I adjusted the clips a lot so that they can be printed without any brim or raft (though you can if you want), and so that its an easy installation while not falling out of the holes.

there's a small chamfer on the pin so that elephants foot at the first few layers doesn't affect the dimensions of the pin and also so that its a easier installation.

I adjusted the blade a lot so that the actual blade part has a curve to it and looks more aesthetically pleasing, while also making it more safe for anyone to use with a rounded point so that it will have a hard time of people to injure anyone, where as the original design was still sharp, and also some chamfers and fillets were put on the model to make it print out better and to also to make it look better.

the handles are rounded off slightly so that it feels a lot better in the hands and also get rid of elephants foot, I've also reduced the tolerances so that there is as little wobble of the blade as possible and also feels better to flip with, while also making it a slight bit heavier.

the 2 handles, 4 clips and pin should be printed out at 100% infill so that the weight is as similar to a actual balisong and also so that it flips better and is stronger, and the blade should be printed out at around 70-80% infill for a good balanced balisong, the handle also needs support but should be super easy to remove with the metal spatula that comes with the printer.

hers a link to the original design: https://www.thingiverse.com/thing:4688406