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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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I had m3 hex head bolts in there at first. They were just too big and looked off and I couldn't find any hex bolts smaller than m3. If you know of a source let me know. I'll reduce the piston and do a test fit and see.