Lidija Grozdanic

83-Year-Old Inventor Designs Inexpensive Open-Source Filament Extruder to Cut the Cost of 3D Printing

by , 03/05/13

The Lyman Filament Extruder, Hugh Lyman Filament Extruder, 3D printing, 3D printer, Desktop Factory Competition, cheap 3D printing, Hugh Lyman patent, 3D printing technology, open-source design, 3D Printer filament, resin pellets, Maker Education Initiative, Inventables

Hugh Lyman, an 83-year-old retiree from Enumclaw, Washington, won The Desktop Factory Competition with his design for a low-cost, open-source machine capable of turning resin pellets into inexpensive filament for 3D printing. The competition, sponsored by Inventables, Kauffman, and the Maker Education Initiative, required that the parts used to make the machine could cost no more than $250.


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Lyman first entered his proposal in August 2012, but was disqualified because the machine exceeded the budget of $250. After modifying the project, he resubmitted it under the name “The Lyman Filament Extruder II”. This time the machine’s design met the budget restriction and was able to extrude different filament diameters, saving up to 80 percent on material costs. Both of Lyman’s open-source inventions have already been downloaded 12,000 times, enabling people to build their own filament extruding machines.

The machine works by filling a hopper with plastic pellets, which are then heated to their melting point. The resulting molten plastic is squeezed into filament and pushed through a nozzle onto the floor.

To highlight the cost benefits, for instance, if one wanted to make 392 chess pieces using a 3D printer, it would require the purchase of 2.2 pounds of plastic, which costs about $50. With the filament produced at home using Lyman’s machine, the price would drop to just $10. Buying the pellets in 55-pound bulks could cut the price even further to just $5.

+ The Lyman Filament Extruder

Via Techland

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2 Comments

  1. great white- shark July 18, 2013 at 2:14 pm

    AWESOME! Shows age is not a digressive guarantee and that what we do and do through out our lives make a difference.

  2. boondox.rob March 5, 2013 at 6:35 pm

    thanx for reporting on this, I’ve done a bit of 3d printing (used to work in 3d/CG production studios) very impressive to see this old [83!!] hobbyist/inventor making such excellent strides 4ward!

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