I changed the filament holders on my rep clones. Now everything works :-)

With the standard holders - the worst were Taulman - all their spools have very small central holes so I was forced to either respool (once) or cut the middle out of the spool to make the hole bigger (once).
As I've nevere managed to get taulman filaments to work - I no longer buy there stuff.
But my new holders will take them.
Likewise flexismart do a spool with a 13mm hole. That would previously have been a problem.

I also have an old reel of reprapper tech black that came on a ridiculously large spool that wouldn't work with the original holders. With the new carriage bolts it hangs lower and works.

Eveyone else I've tride uses spools with large central holes - so no problem.