Adjustable 8mm linear bearing

Concept design of an adjustable linear bearing to suit 8 mm OD linear rail
Id had a few issues on my old original Mendel machine where the 8mm smooth rods are not very good quality and the diameter tolerance isnt very good. Add a couple of years of wear and the standard LMU8's were noisy and loose so i have designed this.
I have printed this with Esun's PLA + filament as it is as easy to print as PLA but has the characteristics of ABS and should suit this application well.
Im using WD40's PT