I have a set of very small files. They are useful for many purposes including cleaning up some parts after printing. I used one of these to file flats on the 3 motor shafts and I think the Z screw maybe but nothing else. The 8 gears with the long belts - you can't file flats on these because you will have to adjust them *after* assembly. Or maybe someone knows how to do it but I certainly don't. Just tighten these extra tight once you have things square (perpendicular).
As far as other cusomizations or modifications - well there are several. I had to adjust the positions of washers for the extruder (and manufacture my own extra washer). I had to cut some bolts for the fan cover. I can't remember what else.
This is a kit. UM tries to do a good job on the kit but there are mistakes, issues, things that don't quite fit - oh yes, I had to do tons of filing of the plywood to get everything to fit. The bed was probably the worst.
Anyway, since you can't file the 8 pulleys flat then there is no definite need to file flat the rest either. I just removed about a half a millimeter of material. It's easier than you may think but optional.
I haven't heard of this recommendation and I'm sure you wouldn't need to do it if you don't wish to.
Do you have a link to where it says to do it?
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