Insert 8 M3 nuts into the nut-holders in the bottom squared carriage and place it supporting the LM8UU linear bearings you inserted in the long smooth rods already installed.Mount the nema 17 stepper motors on the two big plastic parts using 8 M3 screws (8mm long).
Insert the M10 treaded rods so each one supports one side of the motor-supporting pieces using a nut on each side (total 8 M10 nuts).Slide the rods into the motor pieces, one on each side (leave an extra 20mm of the rods in one of the two sides protruding from the part towards the motor, this will later be used for supporting the Arduino holder).Slide two LM8UU in each of the two longest smooth rods.I recommend the following building sequence: Or you can download STEP model or access Onshape CAD design from Thingiverse.
The explode feature may give you an idea of what is inside of another part. There is a live 3D model you can see for yourself in here.
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