This upgrade uses a spring loaded pressure plate to uniform feed regardless of filament thickness. It also compensate some fast retraction problems I had in precedence.
I found that sometimes the filament you buy it’s not always “perfect”… the diameter should change just a little (0,1mm) but what I got recently was not that perfect…
Finding the right amount of pressure it’s a matter of experience, but if the diameter of the filament varies too much, it’s possible that sometimes it will be too loose or too “grindy”.
This is a really simple upgrade that solves brilliantly the problem.
SKILL: nothing special, if you bought a 3D printer this is a pice of cake 😉
TIME: 30 minutes if you drink a coffe meanwhile
TOOLS: nothing special, just scissors, screwdriver and a soldering iron
WHAT YOU NEED: 1 spring (11mm diameter), 1 M5 bolt longher than 7cm, 2 printable caps (I prepared theese: http://www.thingiverse.com/thing:36778)