Beware of generic kits claiming to be V-Core 3.0 -> 3.1 upgrades. The joiner plates were for a 3.0 even though they stated 3.1 joiner plates. The flanges on the F695ZZ bearings were so rough they acted like grinders on the belt edges. Significant wear after one 60 minute print (note: have over 400 hours of printing on the old idlers and pulleys with almost no wear at all).
#V-Core 500 3.0 -- 3.1 Upgrade Woes
grizzled reef
shut widget
Beware of generic kits claiming to be V-Core 3.0 -> 3.1 upgrades. The joiner pla...
You can modify the 3.0 plates to fit 3.1 if you're handy - https://www.printables.com/model/248730-ratrig-v-core-30-to-31-xy-joiner-plate-modificatio
Also, the bearings are built to a standard, of which does not have a chamfer specified for the inside edge of the flanges -- this is almost expected with generic bearings (maybe even quality bearings, I haven't seen too many in person). I'm with you on being concerned about this, I actually took a jeweler's file and attempted to modify those edges on my bearings as best as I could.