I just installed a Smart Extruder+ and it is better, our Z18 is printing very well. Flats are smooth, curves are nice, even super small supports are working again. They revamped the mechanics in the extruder, no more metal plate on the bottom. The extruder core moves up and down much smoother with very little side to side play. It has a filament tube guide on the top, it changes the path and allows the lid to be put back on.

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