Multi-Mode Scale

This is a general-purpose scale but with a secondary mode for weighing and estimating filament length on a Bambu Labs spool. The empty weight of a Bambu Labs spool (including the cardboard rim that hold the RFID tag) is close to 240g. This figure is automatically subtracted when a partially full spool is loaded, and the remaining filament length is displayed. The base of the unit is fairly chunky to give it some weight and rigidity.All parts are printed in PLA, but any filament can be used.The display is a 4.3in VIEWE 800x480 pixel TFT (probably overkill) which incorporates an ESP32-S3 processor (definitely overkill) and the Load Cell is a 20kg unit driven by a HX711 amplifier.The parts that I used are here: DISPLAYhttps://www.aliexpress.com/item/1005007558354417.html?spm=a2g0o.productlist.main.15.348cQ47CQ47CuJ&algo_pvid=b257dd80-7dd3-4b6f-b531-c94ff99842a0&algo_exp_id=b257dd80-7dd3-4b6f-b531-c94ff99842a0-14&pdp_ext_f=%7B%22order%22%3A%2282%22%2C%22eval%22%3A%221%22%2C%22fromPage%22%3