Summary

Axis 1 and 3 Linear (X and Z)

Axis 2 Rotational (Y)

Updated design

Uses screws and nuts (regular and with nylon inserts): M3: 40mm ; 30mm ; 20mm ; and 3x 12mm
Uses also 2mm diameter precision stainless steel rods as railings.

Open SketchUp model to adjust your tolerances, the dimensions in there are optimal for my machine and material (0.35mm nozzle and PLA-PHA). In the Sketchup model you'll find the Assembly Instruction in the Layers window.