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cleaning nozzles with steel needles?

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You can definitely pass through the nozzle but don't go so far that you scratch the teflon which is typically at least 2 nozzle heights away from the tip of the nozzle.

 

These are acupuncture needles.  They have a pointy tip.  I like hypodermic needles a little better as they have a sharp edge and can scrape the inside of the nozzle tip nicely.

 

I have been meaning to cut or grind the tips of my acupuncture needles flat to see if that works better.  Or maybe at a tilt (like hypodermic needles) instead of a point in the center.

 

I find a cold pull is usually good enough for cleaning inside a nozzle but if you have a bit of sand or fiber in there then pushing the blockage up into the heat chamber of the nozzle using a needle followed by a cold pull works great.  But in reality this hasn't been an issue the last few years for me.

 

Another trick for cleaning a nozzle is to burn everything (remove nozzle from printer first of course) over a gas stove.  Don't let the nozzle get red hot.  Just hot enough to produce black smoke.

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I use a tiny injection needle, of which I cut off the sharp cutter tip, and rounded off the edges. Sharp edges might damage the soft copper or brass of the nozzle. But even then I take care not to apply a sideways load, so I don't wear out the circular nozzle-opening into an oval.

 

Originally the needle was 0.41mm thick, so I sanded it down to 0.39mm, to make it fit into the 0.4mm nozzle opening.

 

This is quite soft steel, and will bend rather than break.

 

DSCN5296b.jpg.bff580d1c16e15e32e89fdb330e78aad.jpg

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