The square plate is for children (200x200mm)
The round plate is for the adults (Ø 200mm)
Feel free to scale up or down.

Updates: 26/9-2022
New base so you can split it in pieces.
base-high-splited-bottom.stl
base-high-splited-midle.stl
base-high-splited-top.stl

Printer settings.

Nozzle 0.4/0.6 (0.6 for the plates, but there is no need you can go with 0.4)
Perimeters 0.2
Infill 10%-20% (0% for Marvin. maximum weight must not exceed 2g)
Support NO

HAPPY PRINTING and have fun :-)