Anet A8 Z-Endswitch

You can use Oben or Oben v2. Oben v2 was designed to be used with one or two Nyloc M3 Nuts glued in. If you use two, you will have to sync the threads.

You need:

2x M2x10
2x M2 Nut

2x M3x18 (stock)
4x M3 Nut (stock)
1x M3x lenght doesn't matter (any stock)
2x M3 Washer (not necessary but recommended)
2x M3x26

or if you use Oben v2:

2x M2x10
2x M2 Nut

2x M3x18 (stock)
2x M3 Nut (stock)
1x or 2x M3 Nyloc Nut
1x M3x lenght doesn't matter (any stock)
2x M3x26