Build your own dome. Here you will find the parts to print as well as the FreeCAD assembly and instructions (in svg images)
All the calculations can be done using the dome Calculator:
https://simplydifferently.org/Geodesic_Dome_Notes?page=3#2V/L2
You can find detailed instructions (in Spanish) in this github wiki:
https://github.com/TecnoLab/domocraft/wiki