I just tried printing the Giant Hollow Two Color World (http://www.thingiverse.com/thing:15658
) using PVC filament from ProtoParadigm.
I sliced this and saved the gcode using Slic3r using Combine multi-material STL files. Then, I printed the resulting gcode using Repetier-Host.
For each layer, the printer would extrude the first color, then move to Y=0 and pause, presumably to heat up the second extruder. The printer would then extrude the second color, then move back to Y=0 and pause, presumably to heat up the first extruder. (Because of all the pausing, it took over 24 hours to complete the object.)
The result was that as the extruders moved back into position to resume extruding, a strand of filament would often be dragged back toward the object, and would be left dangling (see photo).
A second result was that there are gaps of as large as 4 mm between layers in some places, presumably because of the cooling that took place between printing each layer (see second photo).
Are there any recommendations for changing my Slic3r settings to obtain better results? Or, would I obtain better results using another material rather than PVC? Or, are these the best results that I can expect to receive when printing with multiple extruders?