3D Models - Taking a Closer Look

3D printing is fairly new in N scale, and for me personally, I have only been doing this about 5 months now.  In my own experience and also observing chatter on various public forums, there are many opinions about the print capabilities, quality, and cost in producing N scale models.  It seems that a common topic is the texture and horizontal banding that often occurs with printed models, and the difficulty in being able to produce a smooth model.  Of course different designs, print orientation, and quality of machines can produce varying results as well.

I thought it might be a good opportunity to take a closer look at some of my models to illustrate some of the actual results I am getting from Shapeways, and highlight some of the potential trouble spots.  You can make your own judgement whether these are deal breakers, or minor inconveniences in the quest to produce a non-existent model in N scale.

Ok, before I go any further, I must give a shout out to my good friend Bob who passed on to me an earth shattering cleaning technique.  I recently sent him a pair of bottom dump trailers to try, and in addition to using some of the tools I have mentioned here on my blog such as a file and sand paper, he used another very clever technique.  Using an old toothbrush and a drop of toothpaste, he gently scrubbed the models to remove the remaining fuzz that is left on these models after they come out of the solvent bath.  I actually tried this myself and it works brilliantly.  So needless to say, Bob has become a permanent consultant of mine in this endeavor.  I hope to share some of his work soon if he allows me.  Take a look below at some examples of raw and cleaned models.

Ok, here is an example of a pair of truck frames right out of the solvent bath, and a pair after a quick scrub using a tooth brush and toothpaste.  You can see the fuzzy texture of residue that clings to the frame sides and detail, and if left alone would give poor results in the painting steps.  For a model like this with a lot of detail, the toothbrush works perfect.  Using a file or sand paper would risk the details being sanded off or broken.  The two frames that have been scrubbed need just some minor touch ups in the little nooks and crannies, and are nearly ready for a coat of primer.  The time spent and level of effort is about 60 seconds each, and very little pressure applied.

Here is another example of several details right out of the solvent bath.  Again, these may look like a lot of work to get to a clean model, but some minor scrubbing is all that is needed for these to be ready for paint.  Check out how beautiful those wheels and hubs printed.  That is amazing detail.

 Here is my grain trailer after solvent.  Again, very clean model without any work.  Some fuzz around the ladder detail on front can easily be removed with a tooth brush and file.

Here is a pair of bottom dump trailers after solvent.  There is some visible fuzz and horizontal banding on the sides.  A little scrub with toothpaste, and the model will have a very smooth side.

There you have it.  Some close up illustrations of work that is out of the box and out of a bath of solvent.  While this may not work for everything, I am convinced that a printed model can compete any day with metal and resin casting quality.  Of course there are costs and other considerations that make this method complimentary to others, not a replacement.  

The best part of all is that my start up cost to get into 3D printing = $0.00 

My Latest Truck Models - Cornhusker 800 Dump Box & Pup Trailer

A very common truck/trailer configuration that I see locally, as well as just about every other place in this country are dump trucks often pulling a pup trailer.  Not far from me in Lincoln, NE is the Truck Equipment Service Company that makes "Cornhusker 800" trailers.  I chose their model for my N scale design since I see these daily any time I am on the road.  The design work was much less effort than my previous models, so I decided to create a couple different versions.  Of course it was also extremely helpful to have an existing base truck model to work with, as I simply reduced the frame length, moved the lift axle to the front of the tandems, and added a hitch plate to the rear for the pup trailer ball hitch.  I just placed an order for these last night, so I will provide some details once Shapeways sends me the printed models.

You can see these new models in my shop now, but they are not yet for sale:

http://www.shapeways.com/shops/NScaleAddict

First up is the Cornhusker pup trailer.  This has a 14' aluminum dump box in two versions: side boards on the top rails, or a flush design without side boards.  The frame comes in two versions as well: a triple axle, and a spread axle.  The tongue and hitch are designed to fit the hitch plate on the Kenworth dump truck below.

I chose to use my Kenworth T800 for my first dump truck, but plan to make a Pete too.  The Cornhusker box is 16' in length, and also comes in two versions like the pup: side boards, and a flush top rail.  The frame has been modified with a hitch plate to accept the pup trailer.  The lift axle have been moved in front of the tandems, and will have single tires versus duals as on my original straight truck version.  Many dump trucks and pup trailers have roll tarps, but many do not.  I chose to exclude a simulated tarp on this model.

I'll throw this model in at no extra charge.  I made some quick design modifications to my Kenworth T800 and now have a daycab tractor.  This gives me both the Pete and Kenworth in a tractor version.

Here is where my inspiration comes from for my N scale Cornhusker box and pup.  The great part about dump trucks in general is that the configurations are almost limitless. As I continue to add more truck models to my design collection, I can simply design the frame to accept my dump box, add the pup, and have a whole new model.  Of course the that doesn't even take into consideration the different designs of dump boxes that are available too, which make the number of possibilities even more great.

Happy Father's Day

Happy Father's Day to you dads out there.  I thought I would take just a couple minutes today and write about a new little project that I have started.

There is a lack of reefer trailers in N scale, and while I have added this to my list of future 3d printing projects, I simply don't have enough time to get to it immediately.  I have a handful of MicroTrains, Atlas, and Deluxe Innovations 48' trailers, and decided to convert some of them to reefer trailers.  BLMA makes a very nice refrigerator unit, and I wanted to take advantage of this ready made detail.  I do plan to design a reefer fuel tank and use Shapeways for this necessary detail, which is a lot smaller project than designing the entire trailer.

I have some refrigerator units on order, and while I wait for them to arrive, I have started painting the trailer bodies.  I want generic white trailers, so I removed the original paint and lettering using a bath of brake fluid. Next came a coat of white primer, and then the aluminum.  I am using common spray cans for this project, and having good results.  I then masked off the top and bottom rails, and painted white again.

Next I will paint the frames, paint details like taillights, add the BLMA chillers, and DOT striping.  These trailers aren't a great match for reefer use, but they should pass for general reefer trailer service.  That is of course until a better alternative is available.

Here's an example of an older 48' reefer trailer that is providing some inspiration for this project.  This is a Great Dane trailer, but not a bad match to the N scale trailers I am using as a starting point.  I'm hoping that a small fleet of trailers with white skins and refrigerator units will reasonably pass for reefer trailers, and add to the overall effect of the Council Bluffs Sub layout.

3d Printing - Still Not Convinced?

I had another Shapeways order delivered recently and just pulled the models out of solvent tonight.  I decided to consolidate everything that I had printed so far in a single photo to illustrate just how far I have come in just 5 months.  It is hard to believe that I literally downloaded Sketchup for the first time around Christmas a few months ago.  Although it was a steep learning curve, I was able to produce my first model which was the Wilson 43' grain trailer just several weeks later.

There have been some bumps in the road, like Shapeways printing models, and then rejecting subsequent orders.  This is a frustration shared by many, and voiced on their dedicated forum.  I have learned some of the tricks to ensure that their manual and sometimes inconsistent review and approval processes don't impact my models.  I am conservative with my drawings, and avoid pushing the limits on wall and wire thickness minimums.  I am now getting very consistent results with my personal orders and sales by others.

Overall, I am very pleased with what I have learned and experienced so far.  Is 3d printing for N scale purposes perfect?  No, but when I look at many of the models available today outside the big names like Kato, Athearn, Atlas, etc. the quality of products has a long way to go still.  And, if 3d printing isn't good enough yet, then I guess we'll just have to sit back and wait for someone or something better to come along and make the models that we need for us.  I have decided to continue down the road I started a few months ago, and see just how far it will take me.

Thanks again for those of you that have purchased my models.  I hope to see some finished models showing up soon around the N scale community.  As you can see, I have my own collection of models waiting for paint and details.  6 more Pete cabs were in the last order, so I better get the airbrush fired up.

http://www.shapeways.com/shops/NScaleAddict