Heyho :)

Here I have a holder for all Arca-Swiss parts.

This is practical if you want to store your camera safely but within easy reach. (I have children running around who can get everywhere :D And when you put them away you just can't get to them fast enough to take the nice photos).

Many people have an L-bracket or another Arca-Swiss mount permanently attached to their camera anyway.

For printing: 
PLA is great. But if you are attaching really heavy parts to it (especially in the long term) you should prefer PETG or other stable materials.

I used 3-4 Perimeter, 35% Infill and Seams set to back.

You will get the highest stability if you print the parts upright (as prepared).
 

Fastening:
The holder is designed for 3.5 mm wood screws. But 3 mm should also work.

System tipp:
I tested this design on a scrap piece of wood but as a future project I will mount a nice looking piece of wood to the wall. So I don't need to use more than 2-3 dowels.

Have fun!