Apologies for such a belated answer, but I would advise you to steer clear of Tinkercad. It is fairly limited in what it can do, and the skills you acquire there don’t really transfer to more advanced CAD software. If I were you, I’d start in Fusion 360, even though I don’t like it and use FreeCAD myself, because it’s beginner friendly and there are a lot of tutorials on how to use it and for what. I would also advise you to start with something simple, like a hook for example. It is a fairly steep learning curve, and there are quirks if you are making something for 3D printing specifically. If you want more info, don’t be afraid to DM me, I’ll try to set you on the right path. Cheers!

Happy printing!

But what if I need only one and I need it today?

Never saw it before, does look similar though. But I guess there are only so many ways of making a thing fit inside another thing through a cutout.

I am more of a double sided tape guy, but you are very welcome to remix the model.

It has a 60°C short program. Fiberlogy PETG doesn’t warp at those temps.

That is why I regularly disassemble mine and toss them in the dishwasher to prevent mold and to clean them from dust and drinks.