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Flexon

Length of bowden tubes?

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71-73cm. You can buy them from 3dsolex - it's hard to find a better price and they are precut to the correct length. And the inside is bevel cut so the filament is less likely to get stuck at the feeder (just as Ultimaker does to their bowdens).

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OTOH, a longer Bowden tube can reduce friction, particularly when printing at the near-right corner of the build area. A few inches longer works better.

Here's a five-foot length of PTFE which is lower friction than what I rec'd on my early UM2. It is a bit less transparent. Also available in 10-foot lengths.

http://www.amazon.com/gp/product/B00KJDE67G

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