The online magazine on the history and operation of vintage scale model trains in American OO gauge

Sunday, January 10, 2016

News! Now available, 3D printed American OO 1:76 models at Shapeways

The topic of 3D printing is one that has generated a lot of buzz. For anyone active in American OO it is huge news actually, as conceivably any model railroad related item found on Shapeways can be produced in 1:76. If a Shapeways designer is willing to do it, all they have to do is change the scale of an existing product and list it for you and others to enjoy.

These are the two models I have obtained so far, a SW7 in the Strong & Flexible material and a SD45 cab in the FUD material. Of the two the cab is the better part, but due mostly to material choice on my end.

OO enthusiast Jack Bartman got things rolling with Shapeways, working with a designer who had previously worked up a SW7 and a SD9 in N scale. He produced for Jack OO versions of both, and I purchased one of the SW7 models. The listing may be found here.

This one I purchased is in what they describe as the “White Strong & Flexible White nylon plastic with a matte finish and slight grainy feel.” I would say that wording, now that I have the model, is marketing at its best and worst. The material has more the feel of a dense Styrofoam than plastic, and it is actually porous! It a type of Nylon, it is flexible but holds the shape well, and has a very grainy, powdery feel -- especially when it first arrived, and I had not blown the excess powder off. The price was right, it is cheaper for a big model such as this, but I will never get this material again, the FUD material is the one to use for model railroad applications.

The SW7 model itself is somewhat low detail, but it is scaled up from an N scale design. Size wise, wow! Wow! I had never seen a full size 1:76 EMD SW model in OO on my layout and it is clearly larger than the AHM SW1 models I have used as stand-ins in OO for years. The AHM SW1 is oversized for HO (more here) but really only about 1/80 scale, and the difference shows. The AHM S-2 works a bit better as an OO model, as does the Fleischmann Baldwin, but the new SW7 model has left me rethinking my switcher fleet to be sure. Probably some more extensive kit bashes are in my future….

I did work up a quick drive for this model from AHM SW-1 parts, as seen in this photo (the fuel tank being made from two fuel tanks). The trucks on this model are the correct wheelbase for OO (the side frames being correct) and lucky for us the (extended) original frame, stripped of railings and trimmed on the ends, will nest right inside the Shapeways body. The weights are off in the photo for clarity, but I am reusing the AHM weights and adding more bulk to them.

I am also planning at this point to paint this model black and be very minimal on the decals. It is a trick we can use to our advantage, the model has low detail and the details are a little rough due to the material choice, black will help hide this fact. Also, with this material you pretty much have to use acrylic paint and I will likely brush paint it, something I have not done on a model of this size in years. Shapeways has a guide to painting this material on their website.

Then we have the sharp SD45 cab. This is from a model that had been originally designed for TT scale use, and the cab appealed to me a lot as I have two SD-something model conversions underway – stalled, really, as I was dreading building the cabs up from scratch. And it is such a key detail, my experience says this is the one detail that will make these models work visually, with the rest of the model is converted from large and mostly over scale HO parts. The cab listing is here.

This one I purchased is in what they describe as the “Frosted Ultra Detail Matte translucent plastic that showcases fine and intricate details.” While my heart sank a little when I saw the SW7 material, this FUD material really excited me. It has the feel in your hands of being a resin casting, a solid feeling (it is actually an acrylic polymer material), and certainly will build up into an outstanding model. Whew!

For a visual comparison, Pierre Bourassa built up this big GE engine from scratch. The Shapeways cab is to scale, matches the size of the GE cab, and really will make the models I have underway look sharp.

Painting the FUD material also has some special challenges. There are a quite a few discussions of this topic online. The central problem is there is a waxy film on the FUD material that has to be removed, and even then you are still looking at using Acrylic paints (because apparently enamel paints won’t dry properly on this material). A solvent marketed as Bestine (use in a well ventilated area!) seems to be commonly recommended to clean FUD parts, and I gather that a 5-10 minute soaking will remove the wax residue and leave the part with a white, opaque finish ready for painting. If you have the equipment an ultrasonic cleaner does a great job too.

For those curious, I am told that a Shapeways designer only makes $3-4 per sale on a part the size of that cab. They are basically individuals designing models to fit their hobby interests and clearly are not getting rich on this, so if contacted they may not be very willing to do a complicated design specifically for you. But again, if it is an existing model that is already listed, they may be willing to help as they can probably bang out the OO version in literally a matter of minutes.

A final note is that end Shapeways price relates to the material you choose for the model and the size of the model. Large models will be quite expensive in the FUD material, but parts such as a cab more reasonable. For more Shapeways OO models search 1:76 or OO in their website, with 1:76 providing more relevant results.


The SW-7 models are in progress here

The SW-7 models are complete here

A 3D printed SD-24 may be seen here

SD-40 prototypes with 3D cab part I

SD-40 and U23B with 3D cabs, part II

Modern Diesels, part III