Wonderful design! Just what I was looking for. Printed for my DDR2, however the QR2 type steering quick-release touches the support piece holding the signals and buttons. Maybe widen base part by 5-10mm? Code uploaded quickly to the mega32u4 micro pro board without any issues. Tested on American Truck Simulator. For more details on parts: - springs x4 0.5x6x10mm - buttons x4 12x12x9mm Everything else was straight forward to assemble. Looking forward to future iterations! Vielen Dank!