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'm assembling your fan right now. I'm using matches to maintain proper air gap between rings. May be you should make some spacers on inside ring? 12-20 pcs, 2mm long?
And parts names: inner and outer rings are confused.

Bladelessfan with 120mm/80mm PC-Fan