4mo ago

Replace your bowden tubes occasionally.

Was having clogging issues so I thought I'd replace and get the mythically good capricorn tubes. This is a good sign that I needed to.

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What you’re seeing is the smaller inner diameter of the dark blue Capricorn. The light blue Capricorn would be similar to your current tubing.
- and even if it were worn down that much it wouldn't cause any problem as the entire tube is made of the same slippery stuff, it's not a coating.
  
  Would a larger inner diameter not cause the transmission of movement to be less direct due to bending and coiling inside the tube? This is probably mostly an issue in bowden systems
  
  The hysteresis that the tubing imparts on the movement of filament is negligible at best. We're talking fractions of a millimeter of difference; and it's something that can be accounted for in your retraction quite easily. Remember that this hobby is LITTERED with people trying to sell you stuff. Be critical in your observations, because even most YouTube channels will tell you that [X] thing is GREAT because if they don't, they stop getting free shit.
  
  Did you measure that? Would be great if it was only fractions of a mm.
  
  The tubing diameter difference is only fractions of a mm, and now you're talking about a 100mm length along. You don't need to measure it, it's literally in the dimensions and tolerance info of the product.
  
  When it comes to pressure advance the difference between a bowden extruder and a direct extruder is more than tenfold. So no, it's not "negligible at best".
  If the difference was negligible no one would put the extruder on the toolhead where the weight has a big impact on maximum acceleration
  
  You don't really use pressure advance in bowden systems because the bowden system is flexible enough that it actually negates most of the advantages of pressure advance. As the pressure increases, the bowden tube itself stretches lengthwise. This has little or nothing to do with the interior bore of the PTFE tubing. The reason you are increasing it so much is because you're overshooting due to the length of the tubing, not the internal diameter.
  We're not comparing Bowden vs Non-Bowden here, regardless. We're comparing generic PTFE bowden, to "Capricorn" bowden anyhow.
  So you've managed to argue the completely wrong thing to begin with, AND you were wrong on the thing you argued. Congrats.
  
  on a bowden system yes, but just ever so slightly. not any more than you could fix with retraction and other settings, and prolly only nylon and other flexible ones you should be doing in a direct dirve anyway would be affected.
- And if you’re doing direct drive the more constrained path wouldn’t be a benefit. I’ve already purchased wider ID tubing for my trident build.

15 comments