Boris Landoni from Open Electronics has designed and built another Christmas project the Spherebot, an open-source robot to draw on spherical objects:
Let’s create a plotter to decorate Christmas Tree balls with writing and drawings.
This machine: a printer, or better to say a plotter, which will draw with a marker on spheres at will, derived from models transformed into G-code files. The machine is easily doable with a few 3D printable pieces (we’ll provide the relative models in a special Thingiverse page) and a control board which is the same of the 3Drag. A computer will be needed for the appropriate printing software.