This is my Z-extrusion cap holding BTT SFS as well as bearing for Z-lead screw necessary for WobbleX.

WobbleX cap uses 608 bearing. It should be possible to possible to install using light-medium force.

The lead screw included in RR V-Minion kit it a bit shorter than it could be. You will probably have to pull it up a bit from the bottom coupler. The version in the photos is not the one published and has the bearing about 5 mm higher but it was still enough to have contact both in the bottom coupler and with the bearing.

You should have approx. 185 max possible height with this mod.

Files with both or just one of the features are avaliable.

btt_filament_backplate_mount v6.stl is not mine creation but I have no idea which model it is…