When I try to union many parts the studio just dosen’t respond. Any solutions?
Try unioning 5-10 parts together at a time and then union the rest together
If you’re familiar, or have time to learn it, Blender would probably be a better option. You can use the Boolean modifier in blender which achieves the same effect as a union but is better since you can then import it into Roblox as a singular mesh. It’s also much more flexible as you are not limited to Roblox’s base parts.