if (!currentPlaneY.guide) {
SliceSlot slot = new SliceSlot(slicePlane, slotPos,
slotDir, (-splineWidth - offsetToEdge),
SETTINGS.materialThickness);
slot.swap();
slot.setOnEdge(new Vec2D(0, 1));
if(crossSliceSelection.getCapType() != CrossSliceSelection.CAP_INSIDE)
slot.makesEdge = true;