You would also need to change out the rods.  They are not hardened and bearings will score them and remove your reasoning for bearings in the first place.

Thats the reason why I want to use IGUS Drylin plastic bushes.

I just wanted to ask if someone has designed a replacment part for the Y-Axis that uses LM8UU sized berings (I want to use some from IGUS). I only found that https://pinshape.com/items/17860-3d-pri … r-bearings but the design is too expensive for me. I wanted to design my own but I dont have alot of time at the moment because of school. It would be very kind if someone would sent me his design. Have a great day

You would also need to change out the rods.  They are not hardened and bearings will score them and remove your reasoning for bearings in the first place.