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You will need to stretch the tips of the blue piece, labeled 'back cover of the Cyclops 97 Do3D.STL', to wear it around the back of your neck. Therefore, using TPU is recommended for better flexibility, although PLA will still work.
 
Here are our recommendations for printers and supplies: https://www.do3d.com/post/what-3d-printers-and-essential-supplies-does-do3d-recommend
Thank you!