This is a connector that can be added to your own designs in order to allow 2 parts to snap together and unsnap again without too much effort. Snaps and unsnaps well using PLA, might need some adjustments for other materials.

The block has a plug and hole so you can try it out and see if it fits your purposes.

Printing:

Can print with any infill, I usually use 15%.

I have used this connector successfully in several other designs. So if you use this connector in your designs, they will be able to plug in to mine. Which is the point!