As we , we are left with stacks of empty spools.

3D Printing
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As we #3dprint, we are left with stacks of empty spools. MasterSpool does promise to reduce the amount of plastic waste that is produced in #3dprinting.

https://3dprinterchat.com/2018/03/what-about-the-spools-empty-spools-and-masterspool-standards/