3D Mouse / Finger Joystick

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The idea is simple: I want a simple and easy 3D mouse.
Despite owning a 3D Connexion Mouse Explorer, I find myself still using my mouse for the translations. So I could use some kind of left hand device to handle the rotations.
Bonus: it can also be used as a joystick!

Print:

• Most parts don't need any -or very few- supports.

Materials:

• Joystick module 5-pin KY 23 PS2 with the circuit board (Arduino UNO starter kit for instance).
• 4x mini press buttons (6x6x4.3 momentary button).
• 1 rotary encoder (5-pin Module EC11).
• 25x 6mm ball bearing (airsoft?).
• 4x M3 bolt + nut.
• Arduino Pro Micro.
• 55mm diameter rubber pad.

Assembly:

1. See remix

Known Issues and Planned Solutions:

• See remix.
• Parts of the present version and the remix should be interchangeable.