Updated 12/01/2023 I got some feedback that the action easy to get stuck, I make a new holder and test it, working better so far. you can download the new file Alien-InnerJaw-Holder-replacement free at: thingiverse.com/thing:5557554 to replace the old one. hope it will solve the issue. This is a lovely Chomper Flower Pen Holder. It has a simple but delicate structure, which can automatically bite when putting a pen on it.
Almost all parts can be printed without support, except the teeth. When printing the body and the jaw should set the cooling fan to 100%.
The pen in the video is unique, it has a 3D printed spring inside the body, so it can be rotated open without a metal spring. It can be downloaded free at: https://www.thingiverse.com/thing:5433906
Another cute Shark Pen Holder download free at: https://www.thingiverse.com/thing:5532639 or https://www.printables.com/model/283386-shark-pen-holder