Dissolvable Support Material Interface - old idea can be closed

I am looking at building a printer with dual extruders, one for dissolvable material, as dissolvable material / limestone is more expensive than pla/abs. Why isn't just the interface layer made out of the dissolvable material?

part in abs
dissolvable material
abs support tower

Edited 1 time(s). Last edit at 11/09/2015 04:08AM by bradleyk.

You could write such a gcode on your own, just make sure you replace T0 where T1 would be used. Then use T1 only on the very last support layer.
eg. Cura has a" post tool change" gcode section to do that.

Sometimes support is needed inside a hollow part.
The dissolvable material should then be on the bottom and top interface layer.
Still there would be situations, where you can't remove the ABS-support structure.
-Olaf

we can cancel this thread, it appears slic3r already has this setting.

Even if it doesn't you can design your own support structures and use only the interface layers in the dissolvable material. It has the added benefit that you can do the support structures more intelligently than an automated slicer can do. It can also cut down on print time.