Dual extruder does support/secondary extruder stay hot during entire print? The hot end set-up for my printer consist of 2 Titan Aero extruders. The printer relies on Reprap firmware and a Duet 3 controller board. When I finish setting everything up, my primary extruder will use ABS and my secondary extruder will uses HIPS. If the model I am printing only has supports near its base, once the supports have been completely printed, will the secondary extruder remain hot/at its printing temperature setpoint until the entire print finishes? Or has this been worked out. Even more specifically say the HIPS extruder isn't needed for several hours during a print. Will it cool down and begin heating up when its needed or just slightly ahead of time? I feel like the HIPS filament left over in the extruder would be ruined after this and likely to clog going forward.

Slicer Cura has a standby temperature that is used when the hotend is not in use. Furthermore, you can write your own filament/hotend change scripts to do whatever you want. You can even do a full cool down of a hotend and full warmup when it is needed again. You can also always edit your G-code file after slicing, use a standby temperature for the beginning of the print where supports are used, and manually change the G-code at the last change to disable the HIPS extruder.