[OXO cube]

I made a 3D printed one over a year ago and used it once

exactly as stated above 
although it will undoubtedly help , I found it a little tedious 
but on the other hand watching a well balanced wheel & tyre rotate for what seems like for ever is strangely satisfying 
the only initial problem I found was getting the pin points on the shafts truly centred at each end 
once that was solved it works great ( if hardly ever used now )

Kev