To create Roblox avatar items, start by setting up in Roblox Studio. Open Roblox Studio and go to the Avatar tab. Use the Rig Builder to create a block rig and set its position to (0, 0, 0) to center it. Export the selection as an OBJ file, ensuring it is centered to avoid incorrect placement.
Next, design your item in Blender. Import the OBJ file into Blender. Use tools like meta balls to create your desired shape, such as a cloud for cloud headphones. Shape your design until it matches your vision.
Then, convert your design to a UGC item. Hide the dummy rig and create the accessory. Use the Asset Creator plugin to convert the model into a UGC item. Specify the part that will become the accessory and its alignment.
After that, create a thumbnail for your item. Use the UGC Thumbnail Tool to create a thumbnail that will be displayed in the catalog. A good thumbnail helps attract users to your item.
Finally, join the UGC program. Apply through the developer forum to gain the ability to upload items to Roblox. Once accepted, upload your items and set them for sale. You can sell items exclusively in your experience or on the Marketplace, earning you Robux. By following these steps, you can create and sell your own avatar items on Roblox.