To do this he’s used Inkscape to convert a .BMP of the knot into a vector image, and then using the G-Code tools included with Inkscape he can create a tool path for the printer.

You can, of course, still add new text using Inkscape’s Text Tool. Upon saving a new PDF in Inkscape, you have the option to embed live fonts, convert text to paths, or omit text entirely.

Inkscape is consistently chosen as the best alternative to Adobe Illustrator alongside other open-source tools which compete with the rest of the Adobe suite.