Rear Hopper Updrage for version b4

Here are upgraded Hopper plates that include holes for 6x2 neodymium magnets to hold the lower plate in place while printing, I have also lengthened the lower guides and chamfered them so it lines up the plates better. Also included is a solid beam for the rear for better stability and less wobble. Last is a new from lever arm which can hold the filimant and a hole for a 2M screw to lock the filament in place. This project is under construction