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Erik

Bowden Cable Coupling for RepRap

by Erik Feb 24, 2010
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Very interesting, however, I am trying to get my M6 nut on the PTFE tube for 3mm ID and it's not going on!!

what inner diameter PTFE do you recommend for a 3mm filament?

See this derivative that is tuned for the Mendel X carriage. http://www.thingiverse.com/thing:2221http://www.thingiverse.com/thi...

Modified Bowden Cable Coupling

Pardon my ignorant question; I'm a total noob at this stuff. It looks like part of this would be hanging over empty space no matter how you orient it, so I don't see how it could be printed without support material. Is this not intended for Cupcake/RepRap?

You're right. One of the pictures was different and this showed a version that could not be printed without supports. I had already changed this, but an old rendering got uploaded with the rest.

I've created a new version. The old one worked pretty well but the holes were very tight for M5 bolts. I printed the new ones while using the first couplings I printed and they work fine.

It still looks like it would need support - all that overhang in the center. If you turn it upside down, there's the bevel near the center.

Upside down works fine. The overhang is chosen to be 45 degrees, for most machines (depending on nozzle shape, layer height, speed, filament, etc.) this is on the safe side of what can be done. You can go further by choosing a low-layer height, or extrude an inner shell first and then pasting the outline against it.
I've been able to makes some 90' overhangs, gravity hardly has an impact on what can be built, it's more how the nozzle tends to push material outward.

Do you have a picture of what you mean by "turning a nut into the PTFE tube"?

Essentially you thread it onto the PTFE. I've added the picture. I've added the part number that http://Adtech.co.ukAdtech.co.uk currently uses.
Here's a video by profounddevices that pointed me to this: http://www.youtube.com/user/profounddevices#p/u/3/ELcNOBYtsQ0http://www.youtube.com/user/pr...