I'm looking to upgrade my 3D printer from a XYZ DaVinci 2.0 Duo running Repetier firmware to something a little beefier with a larger build volume, more accurate manual/auto bed leveling/calibration, and more availability to inexpensive replacement parts. I was interested in the following two models, the FLSUN F3 and the Zonestar Z10M2. The separate dual extruder setup works fine for most of my projects that require support material, but I can't find a straight answer regarding the overall performance of printing, say, a precise mechanical model that will undergo heavy use which require support material with a dual extruder model, or a single extruder with a mixing valve. If anyone more experienced in the craft could offer some insight, it would be greatly appreciated.