OLSC
Below is a posting from SoulSwindler about duplicating your lightsaber, I'm not able to confirm it as of yet but working on it.
Step 1: While onboard the Ebon Hawk, equip Visas with a lightsaber.
Step 2: Go to your workbench, and choose to upgrade an item.
Step 3: Go to the lightsaber list, and select the saber Visas has equipped.
Step 4: Select the color crystal, and change it to a different one and assemble.
Step 5: Select the color crystal again, but DON'T change it, just hit assemble again with the same crystal that is on there. This should cause an extra, duplicate saber to appear in your inventory.
Step 6: With the new saber in your inventory, save your game and reload it, and you will offically have the duplicate saber.