Q&A: Belts, Slicers, Extruders and a Printrbot Simple Metal question overload!

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Second Q&A session! This time featuring questions (and answers) on the ideal belt type, direct vs. geared extruders, the different slicers and a whole bunch of topics around the Printrbot Simple Metal!
Printrbot section at 7:56
Firmware guides mentioned in the video
Silicone heater mats:
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