How-to Library: 3D Printing, Part 3 – Casting 3-D Printed Objects By Angela Cotey | December 20, 2018 | Last updated on November 7, 2022 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Having trouble viewing this video? Please visit our Video FAQ page To complete her 3-D printing efforts, Kathy now shares her process for casting detail parts by using the 3-D printed components (oil drums) to make a mold.