The Best, cheapest nozzle cleaning kit you can own..

[Geoff]

Guessing none of those sizes would be good for a 0.4mm nozzle?

Anything UNDER 0.4mm will fit, so yes they will do fine, the E and B string anyway... These are perfect for the 0.4mm nozzle on my flashforge. The 0.3mm is on my kossel - but I use it for both.

There are even lighter gauge strings you can buy, yo just want cheap light gauge strings.

I found some steel wire on ebay, 0.38mm.

http://www.ebay.com/itm/231011449336...%3AMEBIDX%3AIT

Wonder how stiff it is tho.

maybe... not sure how rigid it is - the reason I use guitar string is because it wont bend easily when you poke it up there

here is a cheap set of strings... $2.16

http://www.ebay.com/itm/6-Pcs-Silver...item19f18d5991

4 of Them will be useless (unless you play guitar and the other two will last you the lifetime of your printer.