I would like to provide a custom firmware to my Lulzbot Taz 5 3D printer so that I can use a different extruder. I understand the risks associated with using custom firmware, but I need to make a minor change so that I can couple the printer with a Discov3ry paste extruder. I want to access the current original firmware of the printer to make the change but am having trouble doing so. I’ve been told I have to download it from (http://devel.lulzbot.com/software/Marlin/) rather than just accessing it through the Cura software we use. However, I do not know how to use the files that I can access from this link because I thought I should be downloading a compressed zipped folder containing all the tabs I should be seeing in Arduino. Does anyone have any experience or tips concerning how I should use the files accessible through the link? Thanks in advance.
Here is the link again: http://devel.lulzbot.com/software/Marlin/