DDPrint: improve your 3D printer with controlled filament extrusion. Improve your (bowden-style) FDM printer by adding a flowratesensor. DDPrint is a 3D printer firmware and the appropriate way of working. Flowratesensor and controlled extrusion gives you: Strong Parts: Avoiding underextrusion and automatic temperature control gives you good layerbonding. Fast printing while maintaining good looking parts. Better process control: closed loop extruder (printer slows down simpler slicing, better first layer... Automatic filament measurement: Filament properties (temperature range) is determined automatically by extruding some filament. Theese properties are stored in a material-profile for later use.