Extruder Dry Lube

Something that helps a great deal is making the Filament Path have as little friction as possible.  You can't use Teflon for the purpose because it decomposes at high temperatures, but you can use 2 other lubricants:

Tungsten Disulfide (WS2) - http://amzn.to/1UBiGog
Hexagonal Boron Nitride (HBN) - http://amzn.to/1ROpa2n

I generally uses the the WS2 spray because it's much cheaper and I didn't see any larger benefits with the HBN spray...

Both of these mechanically-bonded powders; they have to be "wrung into place"; to do that, I use the following process:

  1. Do a Nylon-Cold-Pull and repeat as necessary to clean/clear the nozzle.
  2. Open the idler pulley so you can insert the spray tube directly into the filament path
  3. Cut a bit of filament so that you can bottom it out and still have it be long enough to put into a drill chuck.  Nylon preferred; if PLA, make sure the hotend is cold before continuing.
  4. Using the spray tube, squirt some lubricant into the filament path.  Protect the print bed from overspray!
  5. Insert the cut filament into the hole and bottom it out.  Chuck it in a drill and twirl it for 5 seconds
  6. Repeat 4&5 3-5 times.
  7. Now do a Nylon-Cold-Pull.  You'll find that it is much easier to pull the Nylon out.

I also use the spray to lubricate:

  • Hobbed bolt - makes it easier to clean
  • Extruder bearings - makes it easier to move even if the gear is on tight
  • Y-Axis idler pulley
  • Z-Axis screws

I've found that normal chain lube is better for the rods & rails, and YMMV on the idler & screws, but if you lube the hobbed bolt, as counterintuitive as it sounds, it doesn't affect the extrusion force and it makes it much easier to clean out after a jam (use a wire brush instead of picking each slot one-by-one with a razor blade).

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