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Compact Bowden Extruder 4mm

by mokash770 May 19, 2015
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Related to the metric comment below, what size bowden coupler are you using (PC4-M6, PC4-M10)? Would this fit? https://www.thingiverse.com/thing:1993384

Tapered thread bowden coupling PC4-M6, PC4-M10
by krtektm

PC4-01, so it should fit with a little effort. I think would be easier to print it integrated if your going that route.

I see metric and standard playing together in your build.... That would drive me nuts... Do I grab a Phillips screwdriver or an hex key etc..

It's actually all metric, the only non metric part is the 1/8 pipe thread which is used because it can be easily drilled to 4mm. As for using. Philips and hex, well I use what I have lying around that fits the job,its not always easy to find metric parts.
P.S. I redid this part with a pivot to reduce the pressure on the filament, but I'm thinking of skipping that design and going for something with an adjustable idler that's easy to grip.

Does this design work with an MK7 gear? I have one and it seems to be too big for it :/

Tip for screwing in: Heat the bed and leave the thread and the piece wifth the hole faced down for a while. It worked fine for me.
To get a good layer adhesion I printer ate 200 with PLA.

Has anyone tried printing flex with this extruder?

It has been done on a similar extruder without tubing down to the drive gear so it should work even better on this extruder.

Ahh nice!

I tried it, but i think my flexible filament got stuck on the inner walls of the PTFE tube. It's really hard to pull out of the tube after trying to extrude it.

Should i try adding canoli oil?
Have you tried it?

I haven't tried flex yet.
Try removing the PTFE from the hot end making sure it's not stuck there and pushing back the other way.

Will try and report back :)

This connection is too fragile and breaks when trying to screw in.

I'll upload a stronger version in a bit. If you already printed one in place try heating the pla before screwing it in.

Abs higher temp will give better layer adhesion.

Is this a regular bearing? By the picture, it looks "rubberized", which could avoid the filament slipping on the bearing when too much/little pressure is applied...

No it's just black even the green seal which looks like a rubber seal is metal.
I got them at a local skateboard shop 8 for $15 quite pricey but if you hold the middle and give them a spin they get about 20 rounds vs eBay bearings you get about 5. I don't think that makes a difference in performance though.