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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 have the hotend similar to the one listed in number 1. It sucks. The filament gets jammed with constant retraction gets bloated at the end and causes slipping/grinding/fail. Maybe it is the nozzle. Granted I ran the printer so many times without filament working out bugs with the steppers that maybe the inside got cooked. So, I ordered another hotend that looked good to me from folger tech ( https://folgertech.com/collections/hot-ends/products/all-metal-hotend-for-abs-pla-for-e3d-or-j-head-type-filament-extruder-1-75mm <-- THIS DID NOT FIT). Will use the throat, heat block, and nozzle. I had a hard time finding the correct top-part of the hot end to fit the printed parts, but finally got the right one after the 3 or 4th try.