HDPE

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High Density Polyethylene

A strong, cheap, durable plastic with a solid melting point of 110C.

HDPE Is one of the more finicky plastics to extrude. It does not stick together well, and because it shrinks a lot when it cools tends to distort readily. Experiments with a roasting bag suggest this may be partly prevented by depositing in a warmed environment. The novice is encouraged to use ABS or PLA before attempting HDPE.

Suppliers

Check the forums... someone might be able to ship you some for cheap.

USA

Price Supplier
$4.50 / lb Call Donna at +1 (330) 854-3010 plasticweldingrod.com and tell them Forrest or Reprap sent you. (5 lb minimum order, delivery on small orders tends to take several weeks, updated 21 January 2009)

More info on Wikipedia.