You punt. [DIY3DTECH] has a two-part video on taking a 2D design (in an SVG file) and bringing it into TinkerCad. At that point, he assembles the part in software and creates a printable object.

2D drawings and more. How does Tinkercad differ from Sketchup? Both Tinkercad and Sketchup are 3-D design tools. The main difference is that Sketchup is a desktop sketching tool that isn’t ...