not if they're 4 years old :-)

It is kind f weird that someone would design an upgrade but not use the existing hobbed bolt, guide-rolley-thing and screws.
But if a few mm of ptfe tube does the same job - all to the good :-)

The sionec stuff is actually a little floppier than than polyflex too - which is good for the flexible prints I make a lot of.

Two clean prints at 30mm/s, so I'll see if i can punch the print speed up a bit. I'll try the next one at 50 :-)