Editing Step 3 —
Back and front extrusions

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Take one of two longest extrusions. It is 370mm long.

On the 20mm face of the extrusion, slide 2x t-nuts on each side (4x t-nuts in total).

Bolt 2x joining plates on the t-nuts using 4x M5x10mm screws. Do not tighten them fully yet.

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