Ah great. The problem I'm having with the mrrace one I'm using is that because the aluminium is soft, and once the tool is spinning, the spring doesn't come into play at all.. it just dives straight in to the work.. this means getting small lines isn't feasable at the moment. I was using a 20 degree 0.1mm tip bit. I've since bought a 10 degree one to try but not had a chance to experiment yet. The goal is to have writing at a width of around 0.2mm.. then to paint that writing.. would that be possible with your set up do you think?
Many thanks