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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The first time I changed filament, I couldn't poke the new filament through far enough. I pulled off the top tube, no blockage there. But I noticed the intermediate white tube has a bigger inner diameter than the hot end nozzle. So I tried again after tapering the end of the filament to almost a point. Then I was able to push it in far enough for it to work. Twisting the filament around a bit while poking helped.