This is a model that would be called 'attached to the ear'. The millimeter I used is 6mm, 

The speed will depend on the machine and the type of PLA you are using. I always recommend that the first layers be printed at a speed between 10% and 20% (although if you are confident and know that the bed is perfectly leveled, you can increase the speed of the first layer to 40%). After that, you can adjust the speed as needed, keeping it between 80% and 100%.

The 3D model of these rings does not require supports, but I always advise keeping them active in case of any minor detail that the ring may need (that varies depending on the program you are using or your machine).

Remember to add supports to ensure a proper attachment.🧀🧀

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