The Monado from Xenoblade Chronicles, shrunken down to fit into your minfigs' hands.
USE A RAFT. YOU WANT IT.
Go for a high infill percentage. It's a very small piece, so you may as well.
Speaking of it being a small piece, you should decrease your printer's movement speed DRASTICALLY, both when extruding and not.
You may want a file to smooth the handle if it doesn't fit your minifig at first.