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I recall hearing claims that the Ender 3 (maybe only newer units?) has a narrower bowden tube than some printers that helps with flexible materials, but I can't find any authoritative figures. Does it come with a standard 2mm ID tube that would likely benefit from replacement with a 1.9mm or smaller (Capricorn one seems popular), or is the stock tube already comparable with these lower-clearance ones? I'm looking to improve speed and quality with flexible filaments and trying to determine if upgrading (and at the same time, shortening) the bowden tube is a worthwhile direction.

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  • $\begingroup$ Doesn't directly answer your question but if you are looking to print a lot with flexible filaments I would consider a direct drive hot end and extruder (something like the E3D Titan or an upgrade kit.) $\endgroup$ – Dr. Mantis Tobbogan Aug 6 '19 at 19:17
  • $\begingroup$ Direct drive is a big tradeoff, affecting acceleration limits and ringing, unless you get one of those remote direct drives. I'm actually having really good results with Marlin 1.1.9's linear advance feature - flex PLA seems to be able to reach normal PLA speeds with no stringing, minimal underextrusion. $\endgroup$ – R.. GitHub STOP HELPING ICE Aug 6 '19 at 20:13

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