Lyman filament extruder

It is named after its developer Hugh Lyman and was the winner of the Desktop Factory Competition.

[1] The goal in the competition was to build an open source filament extruder for less than $250 in components that can take ABS or PLA resin pellets, mix them with colorant, and extrude enough 1.75 mm diameter ± 0.05 mm filament that can be wrapped on a 1 kg spool.

The machine must use the Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) license.

The use of DIY filament extruders like the Lyman can significantly reduce the cost of printing with 3-D printers.

[2] The Lyman filament extruder was designed to handle pellets, but can also be used to make filament from other sources of plastic such as post-consumer waste like other RecycleBots.