Plasma-worn belts.

It would help to see some pictures of your setup.  Otherwise we'd just be guessing in the dark. 

Also, I am going to move this to the plasma and laser section to get more visibility as this is not gui specific.

If the 15mm belts got worn beyond usability in such a short time frame, there is something very wrong mechanically with the machine, OR to powerful motors with very high accelerations, but i doubt it is the latter as that would be easy to hear while the machine is in use.
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I use HTD3 15mm wide on all my machines, on both Y axis, and GT2 10mm wide on X axis. They are in use for over 2 years, daily, in shops that work from 7AM to 5PM every day, during summer even Sundays, i never had a belt fail. Mine are POW-GE or similar, china made but at 12 Euro/meter not cheap.
I had them doing 55 meters/minute for several days, all day, still did not fail.
So, you see why i am so baffled at this....