Magnified Pictures of Nozzles - Fascinating!

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basilfawlty
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Magnified Pictures of Nozzles - Fascinating!

Postby basilfawlty » Mon Nov 21, 2016 6:20 am

Over the last 30 days I've struggled with stopped prints. I'm still not 100% sure of the cause but things seem to be running smoothly now.
As I was diagnosing various components I put my nozzles under a microscope and was fascinated by what I saw.

This is a brand new Raise3D brass nozzle. It looks way rougher than I thought it would!
IMG_0830.JPG


This is the nozzle I was running. Wow. Totally mashed. I had is strike one of the clips on the bed. I guess the damage was more than I thought.
IMG_0829.JPG


Here is a new .6 stainless (edit: apparently it's coated brass) nozzle (also from Raise3D). Notice how smooth it is.
IMG_0832.JPG
Last edited by basilfawlty on Mon Nov 21, 2016 6:08 pm, edited 2 times in total.
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Vicky@Raise3D
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Re: Magnified Pictures of Nozzles - Fascinating!

Postby Vicky@Raise3D » Mon Nov 21, 2016 6:57 am

The harden version is not stainless but also brass but with a coat out.
We also have 0.2mm and 0.4mm harden nozzle on sale.

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basilfawlty
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Re: Magnified Pictures of Nozzles - Fascinating!

Postby basilfawlty » Mon Nov 21, 2016 7:09 am

That's interesting. Are there any benefits to the non-coated version? The prices seem to be the same for coated and non-coated.
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Vicky@Raise3D
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Re: Magnified Pictures of Nozzles - Fascinating!

Postby Vicky@Raise3D » Mon Nov 21, 2016 7:31 am

The coating will affect heat transfer efficiency. The non-coated nozzle will more approach to the temperature of heating block.
The main course of the coating for wear preventing.

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basilfawlty
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Re: Magnified Pictures of Nozzles - Fascinating!

Postby basilfawlty » Mon Nov 21, 2016 7:34 am

That is helpful information. Thank you Vicky. Does the coating affect the temperature by a certain percentage? That is, when using a coated nozzle should I be increasing the nozzle by a calculated percentage or a specific number of degrees?
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Vicky@Raise3D
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Re: Magnified Pictures of Nozzles - Fascinating!

Postby Vicky@Raise3D » Mon Nov 21, 2016 10:14 am

It doesn't have such large influence. Just a little. No need to set a special value for it.

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Vicky@Raise3D
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Re: Magnified Pictures of Nozzles - Fascinating!

Postby Vicky@Raise3D » Tue Nov 22, 2016 5:49 am

One more benefit I forgot yesterday.
The one without coating has better heat resistance.
The brass one can reach to over 350C.
But the coating will lose efficacy at 300C.

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walshlg
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Re: Magnified Pictures of Nozzles - Fascinating!

Postby walshlg » Thu Dec 01, 2016 2:40 pm

FWIW I found that printing PTU was much harder with the coated nozzle than the regular brass.

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Re: Magnified Pictures of Nozzles - Fascinating!

Postby NewbPilot » Thu Dec 08, 2016 2:33 pm

walshlg wrote:FWIW I found that printing PTU was much harder with the coated nozzle than the regular brass.


I am assuming that was a typo for TPU. Or did you mean PTU and I need to look it up? I was about to change from the stock nozzle to the coated, but since I print a lot of TPU, I'm now worried.

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walshlg
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Re: Magnified Pictures of Nozzles - Fascinating!

Postby walshlg » Thu Dec 08, 2016 5:30 pm

ok its tpu AND some tpe!

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Mecha_Monster
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Re: Magnified Pictures of Nozzles - Fascinating!

Postby Mecha_Monster » Thu Dec 08, 2016 7:02 pm

I think that this is a very important topic.

Time ago I was struggling very badly with a "clicking" issue. I dissembled and cleaned the hot-end at least 4 times without solving the problem, in the end I noticed that the tip perforation was oddly shaped (presumably because I doped it a couple times before, and once it rammed against the metal clip when I cancelled a print). I changed the tip and the problem was gone. I only noticed the problem because my nozzle was noticeable deformed; I wonder if very small deformation (those that cant be visually noticed without a microscope) can cause problems that resemble a clogged printer?

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walshlg
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Re: Magnified Pictures of Nozzles - Fascinating!

Postby walshlg » Fri Dec 09, 2016 10:23 pm

I've been dropped many times and only mildly deformed!

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basilfawlty
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Re: Magnified Pictures of Nozzles - Fascinating!

Postby basilfawlty » Fri Dec 09, 2016 10:29 pm

walshlg wrote:I've been dropped many times and only mildly deformed!


You're not alone. :)

Also, replacing my deformed nozzle only helped a little. It reduced the frequency of stopped prints by about half. On the other hand, I haven't had a clog since I switched to a new drive gear a few days ago. I'm starting a 55 hour print tonight so we'll see if the results are consistent.

Here are close up pictures of the gears.
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