I also explain how to burn a bootloader to a 3D Printer that doesn’t have one yet. But really, you might not even need one! Use a USBtinyISP as a programmer or re-purpose an Arduino board you might already have to upload anything even to mainboards that do not come with a bootloader installed.
If you want to 3D print really large parts, you have two options – either build a really large 3D printer with its own rigid frame or use the frame you already have: Your house! And that’s exactly what the Hangprinter is doing: It’s a fully featured frameless 3D printer that uses the room it’s set up in as a frame and suspends itself from the walls and ceiling with high-strength line.