!!DON'T USE IT WITH STOCK ENDER-3!!
Modifications to fit with linear rails mod (X & Z) as it add some depth, must have at least the Z linears to work, otherwise dimensions will fail, use stock.
Make sure rods are vertical and not bent.
It also add more body to touch the X axis plate without the need of spacers or extra hardware to fit between and keep it more robust with less flex.
Get other parts from original thing
If you use direct drive here's the spool holder i use: https://www.thingiverse.com/thing:3501056
Print in a strong material with low flex, like PETG or PLA.
Use supports and print as oriented.