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Scratch Building In 2019 With 3D-Printed Parts
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 Posted: Fri Nov 8th, 2019 03:06 am
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John Ray
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Holy Smokes, Tom.

That is nice!!!   Great CAD work.


I really would like to see your print results...

You have gone well beyond me in fine detail.


John


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 Posted: Fri Nov 8th, 2019 03:15 am
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John Ray
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The way the printer controller breaks up curved surfaces, makes them difficult to print.

The attached tank took a fair amount of sanding, to negate the segmentation of the curves.

John





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 Posted: Fri Nov 8th, 2019 05:01 pm
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Tom Ward
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John

Your tank looks excellent. 

The rivet detail really came out nice. 

What scale is that in?

- Tom


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 Posted: Fri Nov 8th, 2019 05:09 pm
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Tom Ward
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I ran into some problems with printing the compressor parts,
but it was all about recalibrating the printer and cleaning the nozzle. 

When I got that all straightened out it printed up nicely,
but I realized that everything was slightly too big. 

I went back and shrunk it down 15% and I'm much happier with the results. 
In the picture below my first print is on the right, final print on the left.
In the background is the whole reason I got started with this. 

I bought a "compressor" on line from a well known supplier. 
When it was delivered the tank was warped like a hot dog and not round,
but shaped like an octagon with flat surfaces instead of curved. 
The compressor and Motor looked kinda crappy too. 

I'm much happier with my own results. 
This is 1:48 scale.

- Tom





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 Posted: Fri Nov 8th, 2019 06:32 pm
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Tom Ward
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John Ray wrote:
The way the printer controller breaks up curved surfaces, makes them difficult to print.

The attached tank took a fair amount of sanding, to negate the segmentation of the curves.


John

I had the same problem with "paneling" on curved surfaces. 

Sean recommended that I change the nozzle to .2mm,
and use the profile for this from Fat Dragon Games:

https://www.fatdragongames.com/fdgfiles/?p=4934). 

Before trying the FDG profile, I tried modifying the .4mm profile I was using. 
It worked but print times became huge. 
For my compressor the tank would have taken 18 hours. 

With the FDG profile it took 6 hours,
clean up was just light sanding and some work with jewelers files.
The results are sooooo much better. 

In the photo I posted above of the three air compressors my first print,
the one on the right, has had no clean up other than breaking away supports.

- Tom


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 Posted: Fri Nov 8th, 2019 06:52 pm
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bobquincy
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Your air compressor looks really good! 

The one you bought, not so good. 

Maybe the hotdog shape is to drain water better from the center?   ;)

boB




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 Posted: Mon Nov 11th, 2019 05:26 am
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John Ray
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Tom, 

The results of printing your compressor are fantastic! 
The finish and detail are first rate,
and amazingly good at 1:48.

The one you purchased,
looks like a lot of the resin parts I have purchased in the past,
molding errors and warping.

The scarcity of quality detail parts in my scale,
is what helped me move to 3D printing.
I will never look back.

Thanks for the input on the profile,
I would like to work with a smaller nozzle for detail parts,
but haven't tried it yet.

Most of the printing I do for myself is in 1:29 scale.

The other scale I work in
(though I've been inactive in it for the last few months)
is Hn30, which is like On30, only X2 !!

John


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