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Compact Bowden MK7 Extruder 1.75

by biomushroom Jul 15, 2014
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Hi Biomushroom

Please note the error on your BOM. The bearing 626 ZZ has an ID of 6 mm. The idler shaft is 8 mm.

One need a 698 bearing.

Thanks for the design. I'll put mine to the test tonight.

We'll, actually it depends on the idler. Some of the idlers have an 8 mm "shaft" and the other's a 6 mm shaft.

Still, thanks for the design. Mine is not working yet...My bowden connector has a 9 mm screw thread, so I need to re-mix this first. But I'm getting there...

Nope. 626 is correct.

I'm currently redesign it in OpenSCAD.
Stay tuned.

I'm currently redesign it in OpenSCAD.
Stay tuned.

Hello, I like your Cold end however My extruder is a E3D_V6 3mm Bowden, I wonder if you either can share the ipt file or modify for 3mm. thanks

Thank you. Hope it'll works great for your needs.

Thank you. Hope it'll works great for your needs.

Would you consider making a 3mm version?

OK, I just received an MK8, and seems it is compatible with 3mm filament.
I'll make some modifications and as soon it will be operational, I'll post the STL's.
Cheers ^^

I've considered it. BUT... As said in the description I got only 2ID 4ID pushfit and I don't find any reliable (read shipping cost) 4ID 6ID pushfit on eBay... Even don't know what kind of MK pulley is needed to carry the 3mm filament.
Surely I'll made one, or at least I'll give it a try. Consider the fact that my NEMA17 is the 1A model, and tend to skip steps at fast printing speeds and I use an high quality 1.75 (I made it with +/-0.01 tolerance) filament in couple with a 0.3 J-Head nozzle.
I'm quite worried that the 3mm filament will be too much for a stepper at higher print speeds.
I'm thinking (and sketching) about of an ultra compact geared extruder, like the Wade but with the size of a Bowden, to step down the motor torque need and at the same time make the feeding of the filament more precise and smooth.
At the moment I'm working on it. Be patient ^^. But, as said, I think it will not be a "pure" Bowden. Surely it should be reliabe for Rostok, Prusa and any other printer that will need some kind of filament to print.
Considering all the above, please tell me if it will fit your needs and if u got ideas about it, shoot it, I'm an open mind!