[cassianoleal]

Zack Freedman's Gridfinity system has all you need and more!

https://www.youtube.com/watch?v=ra_9zU-mnl8

https://gridfinity.xyz/

https://all3dp.com/2/gridfinity-simply-explained/

[rcarmo]

There are resistor and capacitor-tailored versions of these. Searching on Printables, etc. will yield a lot of results.

[amelius]

Looks nice but requires a LOT of printer time.