Chinese Bulldog extruder enhaced (a.k.a. triying to make it good)

thingiverse

So! i bought this bulldog, thinking: nice! is cheap and it seems to be good! but no. those friends from china copy this extruder and, the copy it bad. baaaad. so i use the extruder without spring, for a year now and it works well, but i need some sort of spring inside for compensate the difference in size of the filament, and... it came to this you will need: 6mm grub screw or blind allen screw. 5mm spring (i use the ones who comes with the bulldog extruder) all the parts above the pulley that i use in the extruder is not the one who comes with it, i replace with a 10mm inox one the two pieces at both sides are the ones who prevent the filament from bending inside the extruder. recommended material: ABS / ABS-PC ENJOY