Parametric Z Axis Coupling
thingiverse
These instructions are for attaching components using a Prusa 3D printer, but since it is parametric, they can be applied to any model. You will need two M3x10 screws, two M3 nuts and two M3 washers. Tighten the screws with peace of mind as the plastic won't break. Before doing so, remember to cut out the support in the middle coupling's gap.
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