I was asked to sum up some facts about the alternative "tinker" firmware. Here are the basics and the main links to start with it:   What is the "Tinker-Firmware"? It's an alternative firmware for machines of the Ultimaker 2 series. The main development was made by me in my spare time. It's open source, based on the standard firmware from Ultimaker, but driven by the community. One of the benefits is that special requirements can potentially be adapted faster. At least there's a good chance