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 2 mm ID tube that would likely benefit from replacement with a 1.9 mm 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.
I disassembled the hotend side of the Bowden setup to check for deterioration (and found an actual hole in the tube!) for the first time since getting a decent caliper, and after making a clean cut to remove the damaged part, measured the inner diameter at 2.19-2.21 mm. I'm not sure if that's enlarged from wear or the original size it was manufactured as, but either way this suggests that upgrade to Capricorn at 1.95 mm (±0.05 mm) inner diameter should make a significant difference vs my current Bowden tube.