MPCNC Corner spacer

My MPCNC (25mm conduit!!) is calculated for minimum length of feet. I see only one principal problem within the Design of the MPCNC since different legth of the conduit is a problem when it comes to the corners/feet.

Of course one can set the height of each corner and simply snug up to hope that things stay where they should. To make sure my feet are all uniform I made these spacers.

Each Spacer is 7mm and you need m3 screws and nuts. Usually no need for nyloc here.

I printed these wit