Roulaizze, I loved your nozzle kit idea. But, for some reason your STL had holes in it. There were holes around the nozzles and missing faces on other surfaces. I borrowed your nozzle sockets then went back to Aisjam's parametric box and created a new one from scratch. But, in the process, I noticed the bottom of the box was hollow wasted space, so I put a lid on the other side as well. It's good for keeping your extras. :o)
Thank you both for the pryor work!

Ultimaker

Ultimaker 2

No

Yes

.175

25%

I would have printed in .3 rez, but I was worried about the threads for the nozzles, so I used .175. I think .3 may have been fine, since these nozzle threaded holes are a tiny bit large, and the nozzles fit loosely. Definitely need supports for the extras compartment.