Adapter for mounting on the original mobile phone holder of the e-UP, citigo and mii.
Since I screwed a MagSafe charging holder directly onto the holder, the cell phone reached up to the air conditioning display.
That's why I extended the linked holding plate upwards. There is now enough space below.

The use of matt filament results in a beautiful surface. I used esun's black matte.

The files contain versions for 16mm, 17mm and 18mm ball diameters. If you need another one, please let me know.

Remix of:
https://www.thingiverse.com/thing:4264281