???? Uh, everyone has been for the last ??? five, seven + years? Go to RepRap.org, Thingiverse.com and simply Google..... This is the AGE OF MAKING.... We are ALL making extruders, hot end, heated beds, filament holders, guides, carriages, sleds, electronics, printers, and on and on .... :-D

Don't forget to show what you make. ;-)