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Building tube wall

Notes: Plastic types for toys: Best to worst: 5. Bio-based (cellulose, etc) 4. Polyethylene and Polypropylene 3. PET 2. Polycarbonate, ABS, Polystyrene, Polyurethane 1.  PVC (worst) Magnetic tubes Wall Plastic magnet cover Magnet styles from McMaster Carr: Magnets (try building a pipe-wall magnetic block out of wood and connect …