which he had on hand. You can see a video of the results below. The device looks good thanks to the 3D printed body; [Ivan] provides the STL files if you want to reproduce his work. You have to ...

A file with .stl extension is a 3D graphic file native to Stereolithography technology. Stereolithography is basically a type of 3D printing technology to create 3D models. What is an STL file?