This is a very small container, meant to store additional pen tips.
I designed it to also be able to mount to the magnets of the BOOX Tab Ultra with some 5x5mm magnets.
It is very small, as I wanted to use this and still be able to put my tablet into a flip case (third party).
If you want to print it to use it with the Boox Tab Ultra, you need to put in the 5x5 magnets in alternating polarity (one N-side to the tablet, the other S-side to the tablet). If you need to change the model or modify the magnets, the layout of the magnets in the ONYX Boox Tab Ultra can be found here: ONYX BOOX Tab Ultra
EDIT-21.04.2024: I also added a sloped version as I preferred a more flush sit on the side.
The author marked this model as their own original creation.