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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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These are M5 that I have used:
http://www.tridprinting.com/Hot-Ends/#3D-Printer-Push-Fit-Fitting
https://www.amazon.com/gp/product/B009ITFXDI/
There are lots of other options in addition to M5, check the STL list and the remixes.