This is a karambit knife with the blade switched out for a comb so that don't accidentally hurt yourself! This model requires quite a bit of supports, although I have added an stl for a version where the blade and handles come separately so you can glue them together and not worry about supports. The design of the karambit is not mine, I have just modified it to have a comb-like blade. If you want to create the original model, then you can find it here:

https://makerworld.com/en/models/139442?from=search#profileId-151980

Also, feel free to scale the model up or down a little bit so that it fits your hand size.