[BJC]

Three things:

1. It really helps to have a reaction surface just behind the belt on longer belt runs. This stops the belts from distorting to the point of hopping belt guides and such.

2. Flat belts do not run well on a flat roller. You need a PVC ring or something for it to center itself on. It's counter intuitive I know. However, because the larger diameter PVC ring's surface velocity is higher then the slightly smaller diameter roller the flat belt will center itself so long as it is touching the PVC ring. Alternitively, the way you have it, the flat belts will always want to ride up the round belts guides.

3. I suggest not mixing flat and round belts so the above won't happen. It can be done. However, there usually isn't any real advantage to it.

Regards, Bryan