3D Resin Printed Titanic Porthole Jigs. The two largest portholes on Titanic can be difficult to drill if you do not have a perfectly centered pilot hole. These resin jigs solve that problem. Simply place the jig over the indentation of the largest portholes (for example) and then run a 1mm or 1.1mm (Godhand) drill bit down through the center of the jig to make a pilot hole. Finally come back with the appropriately sized drill bit for your port hole to finish drilling it out.
