A simple bite handle indicator for the Balisong trainer from OwenTF (link below), so you never cut you fingers again ;)
I printed it in TPU and that works the best for me.
(Tip: Print in a bright and flashy color so it stands out when the trainer is moving)
https://www.printables.com/model/764875-balisong-trainer-hardware-optional
The author marked this model as their own original creation.