Mixed Mode Printing Vase/Infill

[ThePrintOfDarkness 0]

I'm printing an over sized C9 light bulb prop in vase/spiral mode and the very tip is not filling in properly. 

 

1) What would you recommend so the tip properly fills in?

 

I'm thinking maybe print "normal mode" for a base, switch to Vase/Spiral, then back to normal mode to fill in the tip.

 

2) Is this possible in Cura?

 

If not I might have to manually edit the gcode. 

 

3) With an Ender 3 S1 and Merlin can I switch mid print to relative extrusion? 

 

Math is hard and this would make gcode editing simpler.