Tis is an integrated mount and cover for a pair of Wago 221-415 blocks.

Apart from the printed parts, you'll need 6 M3 threaded inserts (3mm or 4mm are fine, but there is space below to allow different screw lengths).  You'll also need 4 6mm (or 8mm) M3 socket head screws for the mount and cable clamp, and 2 25mm M3 socket heads to secure the case.  The whole unit can be mounted on a flat surface using 4 M3 socket heads.  

One of the wires needs to be between 15 and 17mm shorter than the other - it is possible to fit them without shortening one, but you'll need to put a severe bend in the wire, which isn't recommended. 

The clamp and the cover have knockout skins fo they can be printed without supports.  Also the mount will print just fine without supports - even a really basic printer can bridge those sections without problems.

It was designed for 0.75mm^2 cable which is sized around 6.5 x 2.5mm.  In the next few days, I'll upload a clamp for larger sized cables, as well as a base plate for countersunk woodscrews.