Craft a Crystal Chest into a Diamond Chest and return 8x Glass
Craft an Obsidian Chest into a Diamond Chest and return 8x Obsidian
Craft a Crystal Chest into an Obsidian Chest and return 8x Glass
Craft an Obsidian Chest into a Crystal Chest and return 8x Obsidian
The above features also apply to the various colored Shulker Boxes, retaining inventories for each.
Chests used as input will now check for an existing NBT tag and retain it when upgrading. See Silk Chests mod (not required).
A demonstration:
NOTE 1: As not to allow odd conversions, the script also requires that you use vanilla colorless glass to create a Diamond Chest, or Diamond Shulker Box.
NOTE 2: Latest script(s) for Minecraft 1.12.2 require CraftTweaker 4.1.9 or higher to function correctly.
Simply place the script or zip file in the "scripts" folder (located in the same directory as your "mods" folder).