You will need to stretch the tips of the "back cover of the Cyclops 97 Do3D.STL" to wear it through the back of your neck; therefore, TPU will work better than PLA.

Please let us know if you have any questions at info@do3d.com.

Here are our recommendations for printers and supplies: https://www.do3d.com/post/what-3d-printers-and-essential-supplies-does-do3d-recommend

Thank you!