I'm glad I got it working too. I was worried about burning out U1 when I was soldering it, but it seems to be fine.
Yeah I trimmed down the filter too, I just did a really poor job on it it seems. I think I need to get some thinner screws since they don't want to go into the fan holes. I should have some somewhere, but I'll have to look later.
I'm thinking I'll tape the wires against the side to keep them folded nicely. That's a good idea to use it as a portable fan. I might have to get it a little more ruggedized before I use it for something like that.
Glad I could make your week! The fan is an Antec brand. They do have some nice ones out there for sure.