Hi all,
I've been struggling for weeks with my Bowden, so I finally went and got new PFA tubing OD 1/4" ID 5/32 for my Ultimakers... it effectively fixed all my problems (over/under extruding, circle roundness, grinding...) ! The larger ID also means I can now use any 3mm PLA/ABS from PRC without any jamming or having the Bowden cable pop (although i use Owen's little gadget to keep it in place, thanks btw).
Also, to get the creaking noise to stop and to give it a bit more slack in the front-left (0,0,0) corner, I cut it to 75 cm (instead of the stock 67 cm) which seems to have made things a lot better as well (smoother bends and less friction)
I paid S$ 175 for 50 FT (around 145 USD or 110 euros). I have about 40 FT left and since i'll never get around to using the rest, I can sell portions of it (at cost + shipping) to anyone who wants some.
Just let me know, you can email me bowden (AT) rnd.sg
FYI, I'm in Singapore.