This is a nozzle holder for a complete set of E3D nozzles as well as the standard tools that come with your Original Prusa i3 MK2. I added some room for a few extra items. This is made to sit atop the PSU on the right side of the Prusa 13 mk2. there is enough clearance for the z-axis to pass to the full height. (see pics)

Print the box portion upright as shown in finished model and it won't require supports.
for the nozzle portion print with supports (and bridge supports) laying flat as shown in blue STL file.

the nozzles follow the same nomenclature of the E3D kit if you buy the full set from them. currently the 0.15 nozzle comes unlabeled however in the future, I am told, it will have 2 dots on a single face to separate it from the 0.25 nozzle which also doesn't have a marking on it. so I used that nomenclature for this nozzle guide. each label has the appropriate number of dots that of the nozzle face.

THE NOZZLE HOLDER CAN BE PRINTED INDEPENDENT OF THE TOOLBOX AND WILL FUNCTION WITHOUT A PROBLEM

TOOLBOX HOLDS: screwdriver, 5 allen wrench, nozzle wrench (prusa), T-nozzle wrench (E3D), 2 box end wrenches, and room for a few more items like scrapers and needle noe pliers.

I included the one piece file but I was never able to get it to print well without a TON of supports so I split it in two and it printed much easier. so print the box portion and the nozzle portion and glue them together. I'd advise NOT trying to print the one piece