Remixed the mounts by Crazybird because the mounting screws do not line up with the FT 2020 i3 Y axis bearing mounts. These make the Y axis completely silent. (well except for the motor) But no no jingleing of the bearings :) I also added a recess to embed the M3 nuts into. They are also super tight so embed them before you install the mount.
These are friction fit so no need to cap them. The tolerance is very tight but not tight enough to compress the bearings.
PLA is fine since these do not touch the heated bed.