Whenever I feel like dabbling in the arcane arts of materialization, I use Tinkercad, too. I like how accessible it is, but I feel like the trade-off is how unintuitive it can be. I've been using it (off and on) for about a year now, and the only way I've figured out to remove parts from a pre-existing model is to stick an "empty" block over the part I want gone, and then click "group"
A tip I can give you though, something I've started doing to make my models less "polygonal", is just grabbing pre-made assets from Thingiverse, then sticking them wherever I see fit onto the thing I'm working on. Give me a sec and I'll post a SK chip that I just made through that workaround
https://www.tinkercad.com/things/kn3YBOo...-parlangua
One must never, never, never rush the plumb bob~
Slow is the way, the only way to go~
Clear your schedule, before you use the plumb bob~
Yes, the plumb bob, is mighty, mighty, miiighty, sloooooooooooowww~