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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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It's this one: https://www.thingiverse.com/thing:1832235

I liked it while I kept spools on the top of my Prusa. I've since put them on a self-standing support above the printer, so that the weight isn't added to the top of the printer itself.

Prusa i3 MK2(s) & MK3 Spool Holder - Frame Mount - Top Loader