RexmecK Item Editor Pro - Silverfeelin/Starbound-SpawnableItemPack GitHub Wiki
Spawnable Item Pack has built-in support for RexmecK Item Editor Pro. You can open the current item directly in the item editor without first having to spawn it.
If using the Steam version, make sure you also use the Steam version of the Spawnable Item Pack.
Usage
With both mods installed, you will see a new button next to the print buttons in the bottom right corner of the window. Simply press this button to open the Item Editor with the current item.