Glenn, your question about which fan I need exactly speaks to my frustration with the spec-less, description-less list of fans here. What fan do I need? How do I know?
I need the one that faces forward on my printer when you face it - not the motherboard fan(s), not the snail-blade fan. That should narrow it down to what fan I need, but do I know? The search-by-printer option on this website listed only one fan, and this is it. So based on the experience and knowledge of those who offered input in this thread, this is the fan I should buy because they’re all the same.
Maybe I DO need the one that LegoManiac pointed out, buty how can I figure that out based on what I can determine from the item description? That’s my point (to beat it to death): a page with a picture of a fan on it and a description that reads “Small Cooling Fan with Ball Bearing 4010 24V” tells me very little about whether this fan is for my printer, or that its the specific fan I need or not. It could be a fan for any gadget, or a fan with one specific use. I’m left to ponder it, or buy it and find out by trial and error.
Doesn’t matter to me now - I have a pair of fans coming from Amazon with the exact same part number, and another fan from here I bought as a pure gamble. We’ll see which fan works for my printer.
And yeah, I do my best to pad my orders for needed items with other un-needed items (filament, nozzles, misc nice-to-have-someday parts). But the free shipping bar here is pretty high, so unless you’re buying a printer or a truckload of filament anyway, its generally not worth adding $100 of misc items to save $15 in shipping.