This is a modification of https://www.thingiverse.com/thing:2733649, thanks to the author for providing the idea.
The parts are only for the right side of the printer, for the left one I used the ones from the link above. I needed more space to the right of the frame for the direct feed petsfang I mounted, and I decided to combine it with the support for z axis, which I took from here: https://www.thingiverse.com/thing:2739921, an upgrade of Cater’s https://www.thingiverse.com/thing:2569379 (again thanks so much for your work).
The design is not fantastic, I was designing something for the first time using 3d builder and Meshmixer, feel free to improve it if you wish.
But it works, as you can see from the pictures. Actually the pictures show the first version, the STL files attached are already the latest version, improved.