Founder of Trinpy, Andrew Karas is a big fan of monster trucks. He decided to combine his passions for 3D printing and monster trucks to deliver this 3D printed monster truck.
“I really like designing objects that are functional rather than objects that just sit on shelves because I believe that is a waste of a 3d printers potential,” Karas says. “I like watching Monster Jam so I suppose that is where I got the initial idea from. In terms of designing it I just looked at a picture of a body of a monster truck that I liked and started modeling it, and then once I had the body shape I cut out a few holes for windows and modeled them up.”
As a skilled 3D modeler, Karas prefers not to use paint on his 3D printed objects, choosing to print out the parts themselves in the colors of his choosing. Because he wanted his truck to be functional, it required that he create multiple parts and assembled them after printing. Andrew created separate designs and springs for the suspension system and fully rotating wheels. Using a design for a Pogo stick he had created a while back, Karas modified it to work as his truck’s suspension.
The design for Karas’ monster truck is entirely 3D printed, and includes 30 individually printed parts, 26 of which were printed in ABS plastic. The other four parts (the orange wheel covers) were printed in flexible NinjaFlex filament. The printing process took a staggering 100 hours to complete, not including all of the prototyping and iteration that the design required.
“All the parts clip together with 3D printed clips included in the design, and the windows clip onto the body,” Karas says. “What I did for this version was to glue the 3 body pieces together with an acetone/abs slurry for extra strength and to make it look smoother. Then the final truck was put into an acetone vapor bath to get the smooth finish for the entire truck. The wheels and suspensions assemblies just clip together and no glue or joining is required. I really wanted to make the whole truck easy to assemble and remove any need for additional joining.”
The truck’s body is printed in 3 separate pieces itself, in order to fit onto Karas’ MakerBot Replicator 2X 3D printer. Each of these pieces took about 12 hours to print out. The wheels each took an additional 6 hours to print.
The final product is very impressive as you can see in the video and photos provided. The monster truck will travel over rough and bumpy surfaces with ease, and it “has a suspension travel of about 20mm per wheel.” The truck measures just about 1 foot in length and required about 2.1 kilograms of filament to print. Karas has made the design files free to download from his Trinpy website.
Check out the video below of the finished monster truck.