meta.frame combo bowden extruder

Again, after trying lots of printed extruders i decided to make something simple, strong, durable and flexible enough to accept different kinds of filaments, both 3mm and 1.75mm, also different types and sizes of idler/gear/bolt combo but using only M3 screws like all my designs. I added reinforcements on some places to maximize toughness and also to expand possible number of push fits to use. Toughest part is to obtain proper tension or more specific finding right spring to use.