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Best Tool for the Job? / Re: 3D Scanning and Printing.
« Last Post by cabbage on Today at 08:08:51 PM »
Here is a milk churn. This is printed at 0.2mm layer height, 0.4mm nozzle, PLA, 10% infil, and 200% frame rate.I took about 20mins.






Regards

Ralph
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Best Tool for the Job? / Re: 3D Scanning and Printing.
« Last Post by Doddy on Today at 12:29:38 PM »
I was being flippant about the Aston Martin for precisely the reasons you point out.  ;D

The single (not pair) printed Peak Cab would be equal to three of your wagons at list price.

On all the variety test printing I had done in 2017 on Rep-Rap and PolyJet style machines to make an evaluation on print quality, there was an enormous amount of finishing to do.

As can be seen from my previous post Re: the V42, the builder printed that on a home printer but still spent 70 hours sanding it down. So your observations on post finishing are correct.
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Best Tool for the Job? / Re: 3D Scanning and Printing.
« Last Post by MikeWilliams on Today at 12:07:34 PM »
Thanks Doddy,

"16microns and still requires a good cleanup, and whilst paint can be used to fill the lines and layers, rubbing the detail off grills and louvres and such, has put me off damaging the cab so far." just about sums up my experience too, so printing direct to wax leaves no opportunity to clean up except on the final cast brass part.  I think the process is great for some things but is not yet the utopia that some firms are claiming for their cheap machines.  And, to put into perspective, what would that Peak cab (which is just fabulous!) cost to print commercially?

The Aston Martin is no real help with models because even 0.5mm layers wouldn't show on that and the originals were filled and rubbed down many times anyway.

Give it a few years and I suspect it will be the only way to make small components.

Mike
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Best Tool for the Job? / Re: 3D Scanning and Printing.
« Last Post by Doddy on Today at 11:50:25 AM »
Could somebody post a picture showing the surface detail from one of these affordable machines please? I know expensive machines can be reasonable but pictures and samples I have seen from home printers are mainly dreadful except for flat pieces like Ralph's building where they can be good. A close-up of a curved surface maybe?

Mike

It is a case of the relationship between the models scale and the dynamics (size) of the nozzle used, the print layers and a whole host of other factors.

As can be seen from this Aston Martin DB4, curves are not a problem on cheap 3D home printers . . .




This webpage shows the difference between 50micron and 16micron printing for an N gauge model locomotive.... https://www.shapeways.com/forum/t/black-high-definition-acrylate.39425/

And again for N gauge Networker EMUs http://www.rmweb.co.uk/community/index.php?/topic/99539-networker-emus-in-n-gauge/page-2

This is a 20micron prop spinner.




This G3 Scale Peak cab is printed on a commercial Polyjet system at 16microns and still requires a good cleanup, and whilst paint can be used to fill the lines and layers, rubbing the detail off grills and louvres and such, has put me off damaging the cab so far.



This G scale Hungarian V42 took 60 hours of printing and 70 hours rubbing down with sandpaper to get a smooth surface... http://www.instructables.com/id/V42-Electric-Locomotive-in-G-Scale-for-Garden-Rail/

This 'Big Boy' was printed over 1000 hours http://3dinsider.com/print-your-own-scale-model-4-8-8-4-big-boy-locomotive/

One of the keys to a good surface finish is the size of the filament used....




And the post processing of the printed items, be it with the use of generous amounts of sandpaper or as can be seen below - by the use of Acetone vapour baths.

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Best Tool for the Job? / Re: 3D Scanning and Printing.
« Last Post by wolfstone on Today at 10:46:57 AM »
Further to post here is a

photo
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Best Tool for the Job? / Re: 3D Scanning and Printing.
« Last Post by wolfstone on Today at 10:39:12 AM »
I have had a tail lamp printed from an actual lamp that I measured and drew in AutoCAD Fusion 360. In the first print the handle was too delicate. Following a re-draw I hope to have some at the AGM if anyone is interested.

Tim
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Best Tool for the Job? / Re: 3D Scanning and Printing.
« Last Post by MikeWilliams on Today at 08:36:42 AM »
Could somebody post a picture showing the surface detail from one of these affordable machines please? I know expensive machines can be reasonable but pi tures and samples I have seen from home printers are mainly dreadful except for flat pieces like Ralph's building where they can be good. A closeup of a curved surface maybe?

Mike
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Best Tool for the Job? / Re: 3D Scanning and Printing.
« Last Post by Doddy on Today at 06:49:25 AM »
One reason to go for SLA as you can print in ash free casting resin that can go direct to lost way, hence its the favoured system of dentists and Jewellers



That's what I thought as well, the master wax image SLA would need to burn off within complicated moulds where as the PLA would just pool in pockets and ruin the casting.

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Best Tool for the Job? / Re: 3D Scanning and Printing.
« Last Post by Andy Mould on Yesterday at 09:43:52 PM »
One reason to go for SLA as you can print in ash free casting resin that can go direct to lost way, hence its the favoured system of dentists and Jewellers
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Help Required / Re: Derlin drive
« Last Post by hornbeam on Yesterday at 08:31:40 PM »
Thanks for the info Andrew. And sounds an interesting project Andy! Please keep me posted on how it goes
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