But I think that is allowed for in the design, when you tension the traveller loop you pull the belt on one side in contact with one set of fixed belt faces, and the other side of the pulley to the other set of faces.
Huh, I didn't think of that. Yes, that would work. Availability of longer lengths at sane prices seems to be a bit of an issue though. Using that technique L, H etc inch belt sizes should also work. I did find a supplier of 30mm H section open belt on eBay. Enough for a 4M gantry driven on both sides would be around £180. Not too bad. It is polyurethane rather than rubber so sticking it could be a problem. Unknown Chinese manufacturer so quality is unknown.
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