yes, its very good idea.
i like polar bots a lot, but from engeneering pow it would be much easier to set up relular cartesian machine with wider X axis and 3-4-5 extruders on it.
you can try put additional extruder on mednel 100 mm x offset and 2 additional y offset 100 mm for try, then you have 4 prints with 100 x 100 mm base.
about 3 set of arms...yes, but not in same Z height., because when arms are in near of tower they are very wide, depends how close is heatbed to tower...
i like polar bots a lot, but from engeneering pow it would be much easier to set up relular cartesian machine with wider X axis and 3-4-5 extruders on it.
you can try put additional extruder on mednel 100 mm x offset and 2 additional y offset 100 mm for try, then you have 4 prints with 100 x 100 mm base.
about 3 set of arms...yes, but not in same Z height., because when arms are in near of tower they are very wide, depends how close is heatbed to tower...