MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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I tested over a dozen of these clips and nothing works for all my spools. Several are attached to the edge and its wall thickness is not standard. This design work like a charm whatever the size of the spool. Congratulations for the best clip design in my opinion.