When I ordered my 0.4mm hardened nozzle I also put a 0.25mm one in the cart because why not. Just found a purpose for it: https://www.thingiverse.com/thing:2483435 Really didn't think that printing something that tiny/precise would ever work, but it did. Sure the gear teeth aren't as sharp (pun not intended ) as the original, but it runs perfectly smoothly anyway. On another note it's interestintg S3D seems to have some issues with tiny objects. Had to "cheat" and make the part bigger because it would "cut corners" for no apparent reason. Might send them something about it if I find time. I wouldn't have expected extrusion to be that precise with such tiny flows on a direct extruder. The "ugly" line about 1/3rd from the bottom is my fault for trying a slightly higher temp while printing and backing off when it obviously showed it was a stupid thing to do. That was PLA at 180°.