I’m with you, and we can make quite cool things in TinkerCad. To translate my question to your shape: if you decide to have larger rotors, or longer arms, you would have to fiddle with groups for a very long time, right? In comparison, with e.g. FreeCad and a shitload of parameters, that would be quick (but you’d need to spend a lot of time defining all those parameters… but only once, though).