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1995 stock tube train in N scale - On Members Workbenches. - More Practical Help - Your Model Railway Club
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 Posted: Thu May 26th, 2011 11:29 pm
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Burkitt
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Having been following the development of 3D printing over the past few years, I've been wanting to have a go at using this new technique, and discovering that Sketchup can now be used to create models for Shapeways plus the release of the Frosted Ultra Detail material has spurred me into action.

For my first foray into this new technology I'm having a go at modelling a 1995 stock tube train, as used on the Northern line, in N scale.



Designing the model to use the Frosted Ultra Detail material allows walls down to 0.3mm thick and details as fine as 0.1mm. There are a few corners which should be rounded but I have modelled sharp, due to the limitations of Sketchup/my skills with it. I'll sort these out on the real thing with a bit of wet and dry paper.
The model consists of a separate body and chassis which should fit neatly together.



It will be powered using the tiny Kato Portram motor bogies, which means the mechanism will not protrude above the height of the tops of the seats, and I may even be able to reduce it from that once I've seen how it all goes together on the real thing.

So far I've ordered a single driving car from Shapeways which will hopefully arrive within the next few days. Once I've seen how it looks and checked it all goes together I'll think about ordering the rest of the train. The modular nature of the 1995 stock design means adapting it into an intermediate car should be an easy task.

Paul

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 Posted: Thu May 26th, 2011 11:42 pm
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Sol
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3D printing & N Scale trains - I am marking this on my Watch list to follow the process you will be using Paul.

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 Posted: Fri May 27th, 2011 10:29 am
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Petermac
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You drew that !!! :shock::shock::shock::shock::shock:

I'm going on a very long holiday ................................:cry::cry::cry::cry:



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 Posted: Fri May 27th, 2011 10:35 am
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georgejacksongenius
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This is going to be really interesting to follow.I assume you'll be building an underground layout to run it on?

Cheers,John.B.:thumbs

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 Posted: Fri May 27th, 2011 12:40 pm
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ddolfelin
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Fascinating.



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 Posted: Fri May 27th, 2011 12:57 pm
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Janner
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This is a very interesting idea which I will be watching avidly.  Presumably the same techniques could be applied to 4mm scale models.



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 Posted: Fri May 27th, 2011 01:08 pm
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Burkitt
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Thanks all.

John C, 3D printing would definitely work in 4mm scale, and more and finer detail could be included than in N. However as volume is cubed when the scale is doubled, the price would increase quite substantially. At 4mm I think it would be better value to use 3D printing to produce a master for resin casting rather than the final model, especially for units with multiple identical vehicles.

John B, I'm not planning on building a full layout, as running six car trains takes up a lot of space even in N scale. But I am considering building a small diorama to display the train, based on Brockley Hill station on the unbuilt Northern Heights extension to the Northern line.



Whether I go ahead with the diorama depends on how well the 95 stock turns out when I get it back from Shapeways, and how much progress I make on Claverton Engineering - I'd sort of like to get one layout somewhere resembling completion before starting on the next one.

Paul

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 Posted: Wed Jun 29th, 2011 09:58 am
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Burkitt
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And here it is...



The driving car arrived by courier this morning and it's a lovely little model.



All the detail has come out as expected, and the surface is very smooth even on the curves. It needs some careful cleaning of the remaining yellow waxy residue though. A bit of light sanding and a few fine coats of primer should also improve it further.



The chassis slightly resembles a banana, but the body is very rigid so when the two are together everything should be fine. I might putting it in warm water and gently bending back to shape too.



One of the bogie sides is a bit yellow, but otherwise they have come out fine.

Now I can get on with finishing and painting this car, and finishing the design for the intermediate vehicles.

Paul

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 Posted: Wed Jun 29th, 2011 10:36 am
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ddolfelin
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Excellent result!
May we ask about costs?



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 Posted: Wed Jun 29th, 2011 10:39 am
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Burkitt
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At the prices when I ordered, it was £29 for the body, chassis, four bogie sides and one bogie centre. However the cost of Frosted Ultra Detail was changed last week, with a lower cost per cm^3 but a $5 startup cost per model, so I'm not sure what the price would be now.

Paul

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 Posted: Wed Jun 29th, 2011 11:43 am
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ddolfelin
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Thanks, Paul.
That seems very reasonable for custom made models.
You must be very pleased - and it may prove useful for many in the future.



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 Posted: Wed Jun 29th, 2011 08:03 pm
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Petermac
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Are you telling us that what we see there only cost you £29 :shock::shock::shock::shock::shock:

That's amazing !!!!

Can't wait to see what it looks like with some paint on it.



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 Posted: Wed Jun 29th, 2011 09:13 pm
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seger1066
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Very interesting to follow this...:thumbs:thumbs:thumbs..



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 Posted: Wed Jun 29th, 2011 09:23 pm
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MaxSouthOz
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I'm also rivetted, Paul.  OK.  I'll be the first of us to admit it - I don't really understand the process.  Can you show us a link where we can see it better, please?

Like skydiving, it's probably not something I'm going to actually do - but it's fascinating to watch.    :mutley 



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 Posted: Wed Jun 29th, 2011 09:53 pm
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ddolfelin
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Skydiving is probably less complicated.
Like falling off a log really.



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 Posted: Wed Jun 29th, 2011 10:20 pm
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MaxSouthOz
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Speaking from experience, Pete?  :cool:



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 Posted: Thu Jun 30th, 2011 12:13 am
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Burkitt
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Thanks all. Yes, it was just £29 for this car, and I think it may actually be cheaper under the new pricing.
Max, Shapeways have a basic explanation of their production process on this page: http://www.shapeways.com/about/how_does_it_work
There is a video showing everything from design to printing and delivery on Youtube at http://www.youtube.com/watch?v=TQoTro9WfbQ&feature=player_embedded
They have some more detailed information about the material I'm using, Frosted Ultra Detail at http://www.shapeways.com/materials/frosted_detail with specifications for the material, some samples, and a description of the printing technology.
This sales video on Youtube shows a similar machine in action: http://www.youtube.com/watch?v=wIo6W4CKScU

Paul

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 Posted: Thu Jun 30th, 2011 02:45 am
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MaxSouthOz
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Thanks, Paul.  I'll have a look.  :thumbs



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 Posted: Thu Jun 30th, 2011 10:54 am
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That is amazing!
I've seen the process before but to produce something of that quality at that cost ...
Looking forward to the finished model

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 Posted: Thu Jun 30th, 2011 02:58 pm
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Burkitt
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Thanks Max and Chris. I've now given the model a careful clean with acetone, which has removed the remaining yellow wax from the printing process and exposed some of the detail which was previously hidden.







It now needs some careful sanding with fine grade sandpaper, alternating with thin coats of primer, to get a good smooth finish.

Paul

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