: If using multiple nozzles, the Dual Extrusion Wizard (Tools > Dual Extrusion Wizard) automates the complex task of merging two models with different materials. 2. Simplify the 3D Model (Reduce Polygons)

I can provide specific optimization tips for your exact setup. Share public link

Are you looking to solve a like poor surface quality or failing supports?

: This defines the thickness of the plastic ribbon pushed through the nozzle. Setting this slightly wider than your physical nozzle diameter (e.g., a 0.48 mm width for a 0.4 mm nozzle) creates lateral pressure, which dramatically improves line-to-line adhesion. Shells, Perimeters, and Infill Density

The software acts as the "brain" for your 3D printer by converting STL or OBJ files into G-code. Simplify3D - Using Multiple Processes 101