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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You could try to hold the wheels on a long nail through their holes. Then press it against a flat piece of sand paper on a table top. Move the nail with the wheels in a diagonal fashion so that you make them turn but at the same time also achieve som sanding of the wheels. This should make them round which makes them turn easier.