Precision Nozzle

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Digitalmagic
Posts: 123
Joined: Sat Jun 23, 2012 8:47 am

Precision Nozzle

Post by Digitalmagic » Thu Mar 21, 2013 2:57 pm

I gave a try making my own nozzle, discovering the *pleasures* of precision machining.

Here is my first prototype.
I experienced the many hurdles to jump, and understand a little better how to craft a precision nozzle.
So, I start from this first cut, trying to design different nozzle sizes and other characteristics, to match existing hotends.
PIC-Nozzle-H12-M8--0.35.jpg
Custom brass 0.35 nozzle
PIC-Nozzle-H12-M8--0.35.jpg (243.72 KiB) Viewed 2208 times
s/o #650 - Wish my digits are ... magic!

zerblatt007
Posts: 196
Joined: Tue Sep 11, 2012 7:48 am
Location: Bergen, Norway
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Re: Precision Nozzle

Post by zerblatt007 » Fri Mar 22, 2013 9:48 am

Looks very nice!
How did you make it?
Did you use the ShapeOko in any way?
Shapeoko #958: Dual-Y drive, Double-X, Belt on outside, 1m Y-Axis, Acme Z, Opened up and boxed in. Kress 1050 Spindle.

Digitalmagic
Posts: 123
Joined: Sat Jun 23, 2012 8:47 am

Re: Precision Nozzle

Post by Digitalmagic » Sat Mar 23, 2013 2:14 pm

Using an industrial lathe and a professional threading tool in a makerspace.
And I managed to drill with small bit.

At this stage, there is nothing very new, though.
Actually, the project is to build nozzle, hot-end up to a full extruder, including dualstrusion reaching 300°C.

I did a mistake in size threading, using M8 instead M6.
This week, I produce M6 nozzles in various "spaghetti" sizes, and will see the printed quality in 0.35mm, 0.3mm and 0.28mm
s/o #650 - Wish my digits are ... magic!

Digitalmagic
Posts: 123
Joined: Sat Jun 23, 2012 8:47 am

Re: Precision Nozzle

Post by Digitalmagic » Thu Mar 28, 2013 3:36 pm

Here 4 nozzles I machined: 0.35mm, 0317mm, 030mm and 0.28mm
Threaded for M6
Nozzles-H12-M6-4sizes.jpg
0.35 - 0.317 - 0.30 - 0.28 nozzles
Nozzles-H12-M6-4sizes.jpg (341.95 KiB) Viewed 2098 times
Now, I can screw then on my printer hotend, do they extrude well? Will see.
Then, am gonna to print the same object, with adequate features, to see which nozzle diameter is interesting to have, below 0.35mm, without recurrent clogging problems.

The lathe has a slightly bad alignment, showing a small eccentricity, (mine is huge) but is not a real issue at this stage.

(Sorry for the picture, trying to shot a better one soon, to clearly see the extrusion channel hole.)
s/o #650 - Wish my digits are ... magic!

Digitalmagic
Posts: 123
Joined: Sat Jun 23, 2012 8:47 am

Re: Precision Nozzle

Post by Digitalmagic » Fri Apr 05, 2013 9:13 am

I successfully extruded some 1.75mm ABS with the custom 0.30 nozzle, mount on a makergear heatcore.
The extruded spaghetti is 0.35mm, comparing with 0.41mm when using a 0.35 nozzle.

Now, am gonna print the same part with 0.35/0.30 nozzles to see the detail enhancement.
With slic3r 0.99 released today, allowing multiple layer heights, it is even more interesting to have dualstrusion to combine layer height and nozzle diam to refine part printing.

EDIT: I printed successfully with my 0.28mm nozzle a simple part with flats and rounds to clearly see the layers.
I printed the same part, with same settings, using a standard 0.25mm nozzle (not mine) to compare.
The 0.28mm gives a quite close result, with more small peaks here and there, but very satisfactory.

I did not get any clogging with my custom nozzles, though I always try to lower extrusion temp at the lowest (205°C / 204°C) when infills aspect starts to look weird.

Now, am preparing 0.25mm and 0.20mm nozzles to explore the ability to fine print.
The printing test am looking for is to match the nozzle diameter with layer height, like 0.20/0.20 0.15/015 and if it extrudes, 0.10/0.10.
I don't think "vanilla prints" need this level of fine grain, but it is interesting to know it is possible, perhaps for some parts requiring mechanical/artistic details.

Also, there is a new trend of "acetone spraying", which can really turn low res part into an apparent more detailed part, with a shiny look.
This trend is clearly at the opposite of fine printing, printing faster, and offering a good post-processing finish, though.

Fine printing on one end, and acetone spraying on the other one, just widen the printing capabilities.
(And multitrusion, BTW)

Trying to add comparing pics soon.
s/o #650 - Wish my digits are ... magic!

bobt
Posts: 132
Joined: Tue Apr 17, 2012 7:08 pm

Re: Precision Nozzle

Post by bobt » Fri Apr 05, 2013 7:02 pm

If you are interested in using acetone to smooth out a print. Here is a thread for just that type of process:

http://www.soliforum.com/topic/448/diy- ... tation-ii/

Bob Teeter
"What Box???" ShapeOko #397

Digitalmagic
Posts: 123
Joined: Sat Jun 23, 2012 8:47 am

Re: Precision Nozzle

Post by Digitalmagic » Sat Apr 06, 2013 10:01 am

Bob,

Yes, a Presto Multicooker! and the guy is looking for matte finish, using sanding with compressed air.
I pledge on this: http://www.kickstarter.com/projects/180 ... expresscom

WARNING: For those who would like to play with heating and spraying Acetone, BE VERY CAREFUL, above a given concentration and heat, Acetone can be explosive.
s/o #650 - Wish my digits are ... magic!

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