makergear m2 e3d filament drive and ez removable fan duct

this uses a slight remix of rsilvers filament drive and a little inspiration from neousagi. i have added some dovetails to the sides if the filament drive then designed an easily removable hot end cover that slips on to the filament drive. with the stock 30mm fan duct its difficult to remove the e3d hot end because you have to slide the duct off the top or bottom of the cooling fins. now you can just slide the cover off and remove the hotend. very easy just like the way the stock makergear hote