2 Shells / 50% infill... helps with he jaw spring action
Raft is recommended but not essential. Do not use automated support as it could fuse the moving parts.
This design applies fine clearances and requires good bridging capability. Prints really well in PLA on a well set up / accurate machine with a filament fan.
This should be an easy print for most machines but the fine clearances and bridging may be a challenge for some less advanced slicing apps and/or machines.
Get your Piranhaz biting!
As soon as Piranhaz are removed from he build plate (with raft removed) they should be ready to bite. A moderate amount of pressure on the upper and lower fins may be required to break the jaws free... but it shouldn't be hard to do for well set up machines printing in PLA and with a filament fan.
If the jaw / biting action is not smooth a small amount of silicone spray on he moving parts can make a big difference. This won't be required in most cases. The jaws should bite without the need to apply a lubricant... but they will snap closed must faster with it applied.