I couldn't get the PLA working properly, jams too easily. If I heat up the hotend, extrude stuff a bit and let it just sit there like 10 seconds or more, it's already jamming. Works when printing larger parts but small details are no-go. I'll probably need to purchase another hot end if I want to print PLA.

So I switched to PETG, which works without problems. Benchy:
https://www.dropbox.com/s/y5dcid34ep...17.42.jpg?dl=0
https://www.dropbox.com/s/oks15cwh9a...17.52.jpg?dl=0
https://www.dropbox.com/s/6qfgqb6k0e...18.03.jpg?dl=0

Also I did some refactoring on the racks and motor mounts, they had bit too much of looseness and I moved one connector a bit as it was causing and unnecessary hole on the side. Also added a tie groove to help aligning multiple parts.
This time I printed the pieces from black PETG; I want to see if PETG would be better material for the rack setup. It's bit more flexible than PLA. Moving the slide manually seems that it does move more freely than PLA when both are moved without lubricant. Will be testing this once I get it installed on the X-axis properly.

https://www.dropbox.com/s/kg924glwrs...17.27.jpg?dl=0
https://www.dropbox.com/s/g7sihbvgs0...19.33.jpg?dl=0
https://www.dropbox.com/s/lkkf0fd0gx...19.14.jpg?dl=0
https://www.dropbox.com/s/g1l6sbkdr3...19.03.jpg?dl=0
https://www.dropbox.com/s/pwudtiqd9z...18.56.jpg?dl=0