How I have extended my 3d printer by adding more heated beds and controlling them with MOSFETs

during of almost 2 months I have succeed to extend my 3d printer from 1 heated bed to 3 heated beds and controlling them using MOSFETs I strongly recommend to watch the entire video I could not do this extension without having another 3d printer to print the new parts key points 00:00 introducing my initial 3d printer 09:20 presenting the new extended heated bed frame 16:43 starting to build the new extended 3d printer 48:38 changing the configuration file in the firmware to increase the X axis length and make the new calibration 1:20:32 testing the MOSFET on one of the heated beds 1:27:34 adding new heated beds platforms 1:34:37 first attempt to print on the new platform 1:48:47 wiring diagram and test the setup with 3 MOSFETs 2:09:45 replace broken MOSFETs using soldering 2:30:19 the final 3d printer extension