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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$2 isn't a lot of risk. https://www.geeetech.com/opto-optical-endstop-end-stop-switch-p-682.html I find the flag very useful as the E3D replacement print carriage I designed sits about 6 mm lower than the one that came with the system and the flag makes it easy to set a new, much lower, z-limit.