Extrusion 2020 end cap

The request

Make an end cap for 20 mm square aluminium extrusion. A 20 mm square cap plate, 3 mm thick, lying flat in the XY plane, centred on the origin in X and Y, its bottom face on Z = 0 and its top face at Z = 3, Z up. A round plug 6.8 mm in diameter and 8 mm long stands up from the centre of the top face, to press into the extrusion's 7 mm centre bore. No holes. Name the sub-part exactly `cap`.

What the AI judge checks

• A small square plate
• A single round plug standing up from the centre of the plate
• The plug is clearly longer than the plate is thick
• No holes anywhere in the cap

Measured checks

• one sub-part named cap (gate)
• cap is 20 × 20 and 11 mm tall overall
• plug is 6.8 mm in diameter
• plate is 3 mm thick at a corner
• nothing stands on the plate except the plug (gate)