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Some of the new multiple extruder / single hotend designs out there, like the Cyclops, need to be able to purge a certain volume of material when it switches from one filament to the other.

An option to define a solid prime tower, either by diameter or by volume of material would be awesome.

Although I kinda like MatterControl, it's pretty slick, but I'm a diehard KISSlicer superfan.

In order to increase interlayer adhesion between the two possibly different materials, it looks like it
- runs the square from two outside opposite corners towards the center for extruder 1
- runs the square from the center to each corner for extruder 2
That way you have mostly the same material for the outside perimeter, with a strip of material 2 in the center, most likely alternating between two sets of corners.
The same strategy could be used for a round prime pillar as well if that's easiest.

For examples of other's solutions:
In Cura they support a square solid prime tower defined by the amount of material to purge, measured in millimeters.
In MatterControl they support a square solid prime tower defined by the length of the side

Thanks!

Alan

you can use the "inflate raft and prime gap" setting for this, it will make the pillar larger, using more material. or you can use the "short wall to last extruder change" to purge both, and then expand as much as needed to get the necessary volume