Hi, I made 3 of these quite some time ago, and then left them in a box and forgot them :-( which is a shame because although it was a fiddlesome process to fit the bearings and wheels as I recall, the result is pretty good in terms of running. Durability is surely also fine with bearings, and they have all just survived being scrubbed with a toothbrush and washing up liquid to remove the dreaded sugar that FUD/FXD models sometimes produce over time. It's always a pleasant surprise to me that the paint survives this, but it generally does, acrylic or enamel. I am exhibiting 3D printed N-gauge wagons at the Royston MRE next weekend, and will show yours and some from other designers alongside my own. Best wishes, Wageni.