The product fits in the Anet A8 without issues . There is only a small problem that the cooling ducts sit lower than the nozzle and thus you need to modify them so they don't interfere with the printed object. Other than that everything else is good. The polymer bearings were a little stiff , but you could always replace them with something of your desire
WOW! Seriously. Wow. Top notch seller; top notch product! Product was exactly as described and works exactly as needed. Provides x-axis belt loops in back as pictured, and the included drylin bearings are good. My only gripe is that the fan mount was printed and not molded plastic -- broke when accidently dropped (unassembled, not the whole chassis). Fortunately the fan mount can be reprinted easily, so nothing lost. Great product for the money!