1 Topic by Sungod3000

  • Sungod3000
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  • Registered: 2014-05-02
  • Posts: 53

Topic: How far should the nozzle be screwed in?

Hi,

After changing from the 3mm nozzle for my first try I switched to the 1.75 and saw that I couldn't screw it in completely anymore. I dont remember how far I put the first nozzle in so I removed it again and scraped some of the half molten plastic out and got the nozzle 1-2 rotations deeper in.

I didnt want to over tighten it so I was wondering if that really matters and if the nozzle depth could influence the output?
Im asking partly because the 1.75 nozzle produces 1.55mm filament and I´m already pretty low with the temp (ABS @180-190°C), so before I get into the more subtle tuning possibilities I want to exclude the obvious first.

Cheers

2 Reply by elmoret

  • elmoret
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  • Registered: 2012-10-11
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Re: How far should the nozzle be screwed in?

1.) 180-190C is not "low" for ABS, its right in the middle of what's recommended. Why did you think otherwise?
2.) Nozzles are intentionally slightly undersized. It is easier for the end user to make a hole bigger by drilling it out than to make an existing hole smaller. The reason for this is all the variation in polymers people could use, temperatures, vertical vs. horizontal, ambient temperature, etc. There wis no one size fits all nozzle size. They are drilled by default to 1.58mm, so you could move up to 1.65mm or 1.7 based on what you said.
3.) Nozzle and coupling threads should be free of polymer, then nozzle should be as tight as you can do by hand (without tools). If the nozzle or extruder body are hot, then use tools (pliers, etc) but only tighten as much as you would be able to if you weren't using pliers.

When swapping nozzles, be careful not to apply excessive force which will bend the barrel.

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3 Reply by Sungod3000

  • Sungod3000
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  • Registered: 2014-05-02
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Re: How far should the nozzle be screwed in?

1.) no particular reason. i worked down from 200 and I´m probably a bit biased by the fear of stalling the motor. I will expand the temp range a bit in my tests.
2.) thats a smart idea keeping it small first.
3.) thats what I thought.

Thats answers all, thanks a lot.