Yes, if we step back and look at what a belt does instead of simply trying to replicate existing ones.
Belt driven Reprap machines have always bothered me. They're fast and now that the price of NEMA steppers is getting reasonable, they're even becoming economical. It bothers me, however, that the belts and sprockets can't be printed very easily.
Last night I was cleaning up a corner block that I'd printed and was cleaning out a bearing seat with my Dremel tool fitted with a cylindrical abrasive head. These are a nice little fitting that lets you slip what is a cylindrical piece of sandpaper onto your Dremel. They are cheap and very effective.
I was looking at it when I realised that the toothed belts are toothed to prevent slippage and that there are other ways to prevent slippage than teeth. An abrasive cylinder, for instance. With an abrasive sprocket you wouldn't need teeth and the belt wouldn't need teeth either.
It was a matter of a few moments to design a 600 belt in Art of Illusion that would easily fit on my Rapman print stage.
A few minutes more and I had it run through Skeinforge and printed it in HDPE.
Cleaning the belt took a few minutes, not no big deal.
The resulting belt is very flexible and quite strong.
I've got a pile of NEMA 17s. I might just print myself out a Mendel now. Mind, I will be using my OWN electronics.