On a fused deposition modeling (FDM) 3D printer ... After some experimentation, he thinks he’s found the solution by using airbrush nozzles. As [René] sees it, the hotend is too close to ...

Hold your airbrush 3 to 4 inches from the model ... Have a question about modeling, operation, or prototype railroads? Send it to Senior Associate Editor Steven Otte at [email protected].