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Bill of Materials

Description Qty Cost, 2025 USD
4mm x 20mm screw 1 $0.89
4mm Whiz Nut 1 $0.45
brads (aka wire nails) 2 $0.01
130 Lb Magnet 1 $1.70

Total: ~ $4.00

In addition you will need access to a 3D printer, or use an on-demand printing service.