Except for cameras, microscopes and similar special equipment, people rarely use fine metric threads, because the coarse thread is already quite fine. So any "M3" should be a standard coarse M3 thread, if not explicitly indicated otherwise. If it is a fine thread, then it would say: "M3 Fine", or "M3 F", "MF3" and/or give the pitch "M3 x 0.35mm" or "M3-0.35", or something like that. I don't know what the official notation is, but I have seen all of these. Not to be confused with "M3 x 20mm" in which 20mm is the length of the screw (including head in countersunk screws, without head in standard heads).
If no pitch is mentioned, standard is M3 with 0.5mm pitch.
Can't you find those M3x4 screws in a hobby hardware shop? I think it is a quite common size. Or else, maybe take a longer M3 screw and cut off a bit?
I think this question of whether to get the complete print head assembly is moot, as I've been searching around, come up empty, and am about to give up looking. This is P/N 225864 for the UM 2+ connect.
Anyway, they have the spacer for sale at fbrc8.com, and so the trouble in parting it piecemeal seems to be figuring out where to get the screws that hold the fan shroud. Anybody know if those M3x4 screws are fine or coarse thread pitch?
BTW... seems that few suppliers uses those part numbers, which is kinda frustrating. And then there's the issue of different part numbers for the same thing... like the glass build plate for the 2-series, which seems to have gotten a new part number for each Model 2 variant.Edited by gdog
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