My original (standard) lead screw bent a bit when I was trying too hard to fit the mount (all my fault). In the end I decided to replace it with this one. For the price it does what it should. I received 2 bars with 2 nuts wrapped in bubble wrap and they appear to be straight (or at least nothing flashy). I didn't use a copper nut as my Ender 3 only comes with a 2-bolt rectangular nut while it is a 4-bolt round nut. I had no problem installing it into an existing nut. The only downside is that it's about 35mm longer than the standard screw and protrudes beyond the frame of the printer. I could try trimming it down later, but it doesn't detract from anything other than the aesthetics.
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