2D jpg to 3D print file?

[david.john]

I recommend to use this 3D Builder: Convert a 2D image into a 3D object (sculpteo.com)

[fred_dot_u]

It's important to note that ScottB has already tried 3D Builder and did not like the results. The tutorial you've linked also shows how the resolution is fairly low and produces sharp transitions on the edges. Learning to convert a bitmap to a vector file is a useful skill for 3D printing.