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After using this mod for a couple weeks, this mod works great!
What kind of spring is needed? One from a standard wade extruder would work?
I am using a spring with 10mm diameter. I think I got the pack at ACE hardware. I had to split it in 2 because it was too long.
Did you need to change out the drive wheel / hobbed bolt as well, or were you able to use the QU-BD one?
I hobbed the original drive wheel with a 3mm tap. It may work without hobbing, but I haven't tested it. I tried modifying the drive wheel first, and after that did not help I created this.
Looks a lot like Bart Drings mod - have you used this very much?
Yes, it is based on Bart's and few other designs floating around here on Thingiverse. I used it for about 4-5 hours of printing so far and it works great.