I apprichiate the great information I am extremely happy with the resolution of my printrbot simple metal, so if i can achive that i will be happy with this build.But i wonder on this wanhao d9 400 mark 1 auction what would be a good price, right now. I beleive nothing is broken, just the z axis refuse to calibrate proper he said.I learn allot about the potential, you can even print bearings and use soft airgun pellets inside, amazing!wanhao d9 400 mark 1 does seem to have a really rigid frame and a big bedsize, and the steppers look solid, thats why this auction was appealing to me, but i feel i should limit to not buy over 150usd, what would be a reasonable price for one that requires some mantance?