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A big issue with 3d printing is you can't really print at angles that create overhangs that are less than about 45 degrees. So, typical threads usually aren't printable. For the shift knobs I make, I use a tap after I print the hole into the part.
My printer has a .2mm minimum layer thickness. You can tell when you print something that there are layers, but they aren't super thick. Obviously, the thinner the layers the more time it takes to print something as well.
A lot of the cheaper printers have issues from the reviews I've read. For example they don't have a heated bed, or their extruder is junk. You may find a good one, but its a case by case basis and you'd want to read up on each one.
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