Anyone else with a double belt setup fighting with slack on the top belt? On my machine with gt3 belts I can see the top belt moving as the carriages change direction. It will pop up off the bottom belt but some times not really become unaligned the the teeth on the bottom belt. Other times I can follow it from under the wheels of the and it is interlocked but at some point it will there will be slack in it. Hoping it's not related to my bottom belts.