TEVO Tornado anti-backlash feed tube spacer

thingiverse

For those struggling with stringing on their prints, I've got a solution that's as straightforward as it is effective: the Spacer (tm). Seriously, I was puzzled by suggestions to tweak the retraction value to minimize stringing during printing. It seemed counterintuitive that different values would be necessary - unless, of course, you're working with varying materials. So, I kept a close eye on my printer as it churned out print after print, and what I discovered was enlightening. The compression fitting used at the extruder had about 1mm of play between the fitting and the nut. And when the extruder retracted material, the entire assembly - including the feed tube - would shift towards the extruder by roughly the same amount. I verified that the feed tube was securely fastened in place, so I knew the motion couldn't be attributed to a loose connection. It had to be the play within the steel nut itself. #Solution: The solution is simple: add a 1mm spacer between the nut and the fitting. This straightforward fix eliminates any play in the system, ensuring that retraction occurs precisely as intended. #Bonus: With this tweak, standard settings now work flawlessly.