A simple jig for making coils for your RBA, made for various sizes, 2mm, 2.5mm and 3mm, if you would like any more sizes remix it or tell me in the comments. You will need a rod or a drill bit of the appropriate metric size for this to work, sorry USA I don't have any imperial sizes to test this. The bottom section has a tight fit to hold the drill bit, make sure you can print this accurately. Edit: added new bottom section designs based on the skywaker Lightsaber!!https://www.youtube.com/watch?v=Tdw46uc3MRYPrint upright, no support. layer height 0.15mm (for the top section), 0.2mm for the bottom section will suffice, 20% infill, 2 perimeter shell min.Choose between the original bottom and the new lightsaber bottom.