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ltc

UM's bowden tube cannot be locked

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Unfortunately, this standard couplings are not fit very much. The problem arises when short much more power is required for the filament transport than usual.

You have at least five ways to change something about it:

- There is a printable solution which keeps the Bowden better.

- You can cut the Bowden tube by a few millimeters, the coupling engages then better again in the material.

- Small rubber rings / O-rings on the coupling neck improve the holding force.

- A ring of shrink tubing can give the coupling more holding force.

- Some use proven pneumatic couplings (connectors).

Markus

 

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All of that is good. I like the "cut a few millimeters" solution but don't cut much more than that. Also make sure you loosen the 4 screws, shove it in there good, then after the clip is on and the bowden is tight, you tighten the 4 head screws a bit to make that bowden in there nice and tight.

If this solution doesn't work the first time, don't try it again - it probably means some of the metal knives in the bowden-holder are broken. So try one of the other solutions.

 

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Another vote for cutting off a few mm of the bowden. Try to make the cut as square as possible for good measure. (remember when it had to be absolutely perfect guys? Those were the days...)

BUT, before you try to re-assemble everything, remove the coupler and look inside it. Since you have scraped the bowden several times there's a big chance that there's ground up pieces of bowden material stuck in the little metal blades that are meant to bite into the tube. Clean that out as best you can with a needle or something along those lines. Also check that the blades look ok in general (not pushed in or missing).

 

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I snapped my bowden clip during assembly - Ultimaker have been great about getting a replacement out to me, and the machine (UM:Original) functions. First print off was the more robust bowden tube holder here:

http://www.thingiverse.com/thing:17027 - you will want to counter sink the extruder side of this otherwise feeding the plastic in is fiddly and its easy to gouge the filament in the process.

There are a number of refined versions of this so have a dig around.

Down side is if the hot end clogs horror results rather than the bowden clip popping off. It'd be good if the extruder assembly mounted a force sensor to try and detect gratuitous jams ("danger Will Robinson, danger!").

 

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