Cappy De on Facebook.
Kirk has great instructional videos. If you have questions regarding general 3d printing procedures and solutions, hit him up.
Tim Hoogeland w/ TH3D
Great hardware including EZABL bed leveling products
Cutting edge Unified Firmware for your Marlin flavored 3d Printers
Incredible knowledgebase regarding 3d printers and electronics. Follow him on Facebook for troubleshooting drivers, boards and electronics. He specializes in TEVO products and is the foremost solution provider for the new Lerdge Boards.