Searching for a suitable 3d printed manual press, and not find one, lead me to built my own press.
I wrote an assembly instruction which I'm sure cam be pronounced better. Feel free to ask me any question I will be happy to help.
I printed it with PLA and it works great.
I mainly use it to insert bearings.
I uploaded a step files so you can edit tolerances.
assembly instructions:
https://docs.google.com/document/d/1Z72QEt-x714-IqG-l6yXR0z1oUkw1TgqJRWoiP_JRok/edit?usp=sharing
The author hasn't provided the model origin yet.