chat I'm looking for keywords/solutions for something 3D printable.
I want to to make a panel with buttons, switches, connectors, ... but I don't want to design it from scratch.
what are these things called? what is already out there?

more details:
imagine the modularity an AV/server-rack, but instead of one <thing> per height, I'm looking at one HU that contains multiple <things>. "like keystone?" yes exactly! just more compact.
I imagine a box where 2 sides are just slots for custom covers

possibility: mount DIN rail, print clips that attach to it, then any box I find can be a "module"

heck, I'd design that box in the slicer directly

re: DIN Rail
something like this would work in that case: https://www.printables.com/model/849182-din-rail-box

it's still somewhat bulky, and not aesthetically pleasing

Din Rail Box by Tom_Designs | Download free STL model | Printables.com

Printables.com

also, shame on me, I don't have a DIN rail laying around at the moment v_v

I could just make it small boxes that attach to each other, maybe via some long screw

takes 3 primitives and some dimensional juggling to create a thing that can take 30*3*Xmm covers
should be enough for now so I can glue some things together to get a feeling for it

@xenontechs

DIN rails, on the other hand, are something you can easily print!