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Newbie issue [message #24560] Mon, 07 March 2011 22:19 UTC Go to next message
avatar kepardue  is currently offline kepardue
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Registered: January 2011
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I'm mediocre at best at 3D modeling, and working on my first model for Shapeways. I've created it in Blender and uploaded it, a model of a house for an HO Scale model railroad. I've hollowed out the inside and the roof, and yet it somehow still seems to think that it's a $130 Shocked model. As near as I can tell, Shapeways thinks that this model consists of a solid interior. Is there some pointer you guys have for modeling such things for shapeways? My ideal was to have the floor and walls as one piece and a roof that's detatchable.

Here's a link to the model as is: http://www.shapeways.com/model/223218/house_rough_9.html

One odd thing I noticed is that the windows seem to be filled in, even though my model has them cut out.
Re: Newbie issue [message #24562 is a reply to message #24560 ] Mon, 07 March 2011 22:42 UTC Go to previous messageGo to next message
avatar Magic  is currently offline Magic
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Not sure there is a problem here. If your model was not hollow, it would be more than $2000 (from the bounding box values). So for me, the hollowing has been taken into account...
Perhaps you can check the volume displayed by Shapeways, with the model computed by your modelling tool?

[Updated on: Mon, 07 March 2011 22:43 UTC]


So many things to design, so little time...
Re: Newbie issue [message #24565 is a reply to message #24562 ] Mon, 07 March 2011 23:06 UTC Go to previous messageGo to next message
avatar kepardue  is currently offline kepardue
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Wow, that's amazing. I know there's a whole category for model train stuff, so it must be a relatively common use. So you're saying that it's a reasonable price for a small 5" long house to be $130-$145? If so, I understand... that just really, really seemed to be a bit steep to me, considering everything I've heard about the new affordability of 3d printing.
Re: Newbie issue [message #24567 is a reply to message #24565 ] Mon, 07 March 2011 23:48 UTC Go to previous messageGo to next message
avatar gibell  is currently offline gibell
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The problem is that we live in a world full of injection molded plastic which is literally dirt cheap. People are accustomed to thinking of anything made out of plastic to be very inexpensive. 3D printing is probably 10 times more expensive than an injection molded part, but this is still a lot cheaper than it used to be.

One can calculate the cost of a hollow cube 5 inches on a side. Simply take the surface area of 25 square inches, multiply by six for six faces, for 150 square inches. This is almost 1000 cm^2, so if it is 1mm thick it will be 100 cm^3 in volume, viola $150.

The model train guys are willing to spend a lot for custom designs ...

[Updated on: Mon, 07 March 2011 23:50 UTC]

Re: Newbie issue [message #24568 is a reply to message #24567 ] Tue, 08 March 2011 01:28 UTC Go to previous messageGo to next message
avatar stonysmith  is currently offline stonysmith
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That's why I work in Z scale Smile 1/9th the volume of HO

It's not uncommon for a Brass Z scale house to run $45 or more, and a Laser-cut Wood kit will run $25-$50. My buildings at $25 from Shapeways seems cheap (to me) in comparison, even though the surface finish is not as smooth as you get from the other sources.

[Updated on: Tue, 08 March 2011 01:37 UTC]


Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
Re: Newbie issue [message #24570 is a reply to message #24560 ] Tue, 08 March 2011 02:28 UTC Go to previous messageGo to next message
avatar kepardue  is currently offline kepardue
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Wow, hate to say it, but that makes scratch building seem like a much more compelling option at this point. I may go ahead and have this one printed for the experience and effect (it's intended to be a birthday gift for my father). Hoping to see these prices fall even more in the future.
Re: Newbie issue [message #24572 is a reply to message #24570 ] Tue, 08 March 2011 05:16 UTC Go to previous messageGo to next message
avatar GHP  is currently offline GHP
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Even though the price doesn't actually seem excessive for the size, you should check that your model has been uploaded as you intended. Shapeway's Meshmedic will try to fix a model that is non-manifold, has holes, or has overlapping volumes, and the results are not always what you may want.
Re: Newbie issue [message #24573 is a reply to message #24570 ] Tue, 08 March 2011 05:20 UTC Go to previous messageGo to next message
avatar GWMT  is currently offline GWMT
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How thick are the walls? Try making them as thin as possible (0.7mm for White, Strong & Flexible) and add 0.7mm thick supports about 20mm apart (like studs within the walls/roof).to strengthen the structure.
Re: Newbie issue [message #24660 is a reply to message #24573 ] Wed, 09 March 2011 15:40 UTC Go to previous messageGo to next message
avatar kepardue  is currently offline kepardue
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Hmm, thought I had posted back to this thread yesterday but I guess it didn't go through.

The walls are actually right at 2mm thick (with grooves cut in them to represent siding). Since this is going to cost as much as it seems like it's going to cost, I don't want to take too much chance that this will crumple up when I start painting it. It's really expensive, but if it comes out well it'll be a one of a kind birthday gift for my father--a model of my parents' house for his model railroad. Plus, I think it'd be good experience.

I may add some kind of elevated squares to the roof to represent shingles, but I think after the tweaks that I've made to account for the interpretation of the mesh medic I'm pretty close to being done.

That said, I would like some of you more experienced designers to peek at my model if you have a spare minute to see if what I've got is practical.

The shapeways page is: http://www.shapeways.com/model/223575/house_rough_23.html

And the model itself is a Blender 2.5 file, at: http://kenpardue.com/misc/986ParadiseRough3.blend.zip

[Updated on: Wed, 09 March 2011 15:48 UTC]

Re: Newbie issue [message #24663 is a reply to message #24660 ] Wed, 09 March 2011 16:19 UTC Go to previous messageGo to next message
avatar stonysmith  is currently offline stonysmith
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I would suggest thinning down to 1.0mm, with 0.25mm grooves for the siding. That will give you (in HO scale) 7 inch thick walls and 3/4inch siding, which is still very prototypical.

Dropping from 2.0mm down to 1.0mm should halve your cost if not drop it by 75%.

If you print it in WSF, there's VERY little chance that it will crumple. WSF is actually exactly what it says.. VERY white, and surprisingly strong Smile

On a house I had printed, I have 0.75mm diameter porch posts that are 11mm long. If pushed, they'll bend a little bit, but you'd have to apply quite a bit of pressure to get one of them to break. One post alone can support the entire weight of the building with no fears of it breaking.

If you want the Detail Material(s), you'll have to make it just slightly thicker (1.25mm walls with 0.25mm grooves) but that should still reduce your cost.

[Updated on: Wed, 09 March 2011 16:22 UTC]


Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
Re: Newbie issue [message #24691 is a reply to message #24663 ] Wed, 09 March 2011 22:08 UTC Go to previous messageGo to next message
avatar kepardue  is currently offline kepardue
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Wow, I'm encouraged to see the strength of the material. I thought that about 1mm thick is the thickest I could go and still have it show up in the model. I slimmed my walls and the roof down from 2mm to 1.2mm, which knocked a good chunk off of the price, but I made back up for that in part by adding a textured roof and a few other details.


http://www.shapeways.com/model/224095/house_29.html
Re: Newbie issue [message #24698 is a reply to message #24691 ] Thu, 10 March 2011 04:30 UTC Go to previous message
avatar GWMT  is currently offline GWMT
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It's looking good - please post some closeup pics of the actual model when you get it. I'd like to see how the shingles print for you.

What about removing most of the floor from the model? Nobody will be able to see it when it's on the layout. You'll also need to get inside to add glass to the windows and doors - you could always glue in a piece of styrene sheet for a floor at the very end.

 
   
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