I am currently experimenting with a fair amount of success with a 2-in-1-out system on my Ultimaker 2, whereby I use a Y adaptor above the hotend and feed the different filaments through one at a time. I am trying some FormFutura PVA filament to try out dissolvable supports, however I have found that, with the UM2 nozzle at least (not sure if it's better with other nozzles), I need a 60mm square(!) purge tower in order to purge the PVA enough such that the PLA has little enough PVA contamination to not delaminate. That's a lot of wasted filament. I noticed in the list of features for Scaffold, it says it's easily purged from nozzles. I am wondering if this has been tested with 2-in-1-out systems, and whether the "easily purged" refers to just purging between prints, or if it actually is designed to work purging between layers. Thanks.