Friday, March 1, 2013

R Class Loco - 3D Printed

I had another delivery today from i.Materialise with the remaining major parts for the R class, these being the chassis and fuel tank.  I have now transferred the bogies, motor, DCC decoder and speaker from the temporary chassis to the 3D printed chassis, and the loco is running again!

The new parts are in grey in the photos below. (As always, click on the photo for a larger view.)

I haven't finished removing the small pieces of plastic from the support structure used in the 3D printing process, hence the numerous small bumps on the underneath of the chassis.  I have just cleaned up the parts enough to assemble and test the loco at this stage. I will have to dismantle it again for final cleanup, detailing and painting.

I designed the chassis with slots to accommodate two brass I-beams to give it some rigidity.  The real chassis is also based on two large I-beams.  The brass I-beams are a standard item from Special Shapes.

The fuel tank is hollow inside and can be filled with lead for weight.

 The headstocks have some detail included, including cowcatchers, and holes for brake and air hoses. The headstocks accommodate a Kadee long-shank whisker coupler.

Previous posts on the R Class:


  1. Have you seen the acetone vapour smoothing method for 3D printed objects?
    It has only been developed in the last couple of months.

  2. Richard, Im trying to get started using Rhino3D, currently working through the tutorials, would you recommend drawing things in 1:1 scale and shrinking them down to 1:64 scale, what did you do?