What did you do? Gnaw on it?
)
I have 250 hours on mine, though maybe only 1/4 of that is actually printing (4 pounds of filament), everything looks fine wear-wise.
Not that I haven't broken or damaged anything though, casualties thus far:
2 printed pinions (gear reduction, one overheated and warped, the other just broke, too thin)
1 printed spur (gear reduction, I didn't reinforce the bolt hole enough)
1 extruder (delaminated at a stress riser, redesigned and printed at higher temp, working great)
3 stripped belt pulleys (garbage, stripped before they got tight they were free, and I know why)
2 bowden fittings and some teflon lining (crappy filament)
1 Ramps board (hot bed trace, it had a bad FET, which I then made worse using an old soldering iron, still works, just no hot bed)
Took a chip out of my print bed (I flipped it over, head fell while I was tensioning a belt)
I know of at least one person using Beaglebone on a delta with Linuxcnc, but yeah, it has a ways to go, and beyond the effort I'm willing to expend.