Using Nylon trimmer line with a PrintrBot and Gaffer’s Tape

2015-06-30 14.20.20bPeople have been experimenting with Nylon trimmer line for a while, and I wanted to give it a shot, since nylon is tougher, more flexible, smoother for moving parts, and can handle higher temperatures.  I found a few small tips which I believe are novel, specifically that (1) gaffers tape makes a fantastic print surface while preserving inductive level sensing, (2) minimum print time per layer is the key to getting good prints with Nylon at high temperatures & speeds, and (3) dickbutt is the best test model in the world.

Summary of findings for the impatient:

  • Trimmer line usedRino-Tuff Universal 0.065 in. x 275 ft. Trimmer Line (Home Depot).
  • Print surface: Gaffer’s Tape. It makes an excellent surface — the nylon adheres quite well, but the tape can be peeled off to help free parts like painter’s tape can for PLA.  No alcohol or glue necessary. I haven’t seen anyone online using it for nylon, so maybe I discovered something new?
  • Get the right size: Make sure your filament is less than the rated size for your printer, not merely close (2.0mm didn’t work in my 1.75mm printer, but 1.65mm did).
  • Don’t trust the size on the label: My “1.65mm” filament was actually a fairly consistent 1.40mm.
  • Cura print settings — after experimenting, I arrived at the following settings (Cura profile INI here):
    • Temp: 230 C
    • Speed: 40 mm/s
    • Fan: off!
    • Minimum layer time: 10 s (essential!!)
    • Retraction speed: 10 mm/s (slower than default)
    • Retraction amount: 1 mm (less than default)
    • Retraction combing: on
    • Travel speed: 160 mm/s (much faster than default)
    • Bottom layer speed: 10 mm/s (slower than default)
  • Heated drying unnecessary: Drying of the filament may help, but I found I didn’t need to given the right printer settings (sufficiently high temperature).
  • Be systematic in your experimentation for print settings!

More details after the break.

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