<![CDATA[SoliForum - 3D Printing Community — 14:1 Geared Bowden Extruder]]> 2014-12-19T20:00:32Z PunBB https://www.soliforum.com/topic/8813/141-geared-bowden-extruder/ <![CDATA[Re: 14:1 Geared Bowden Extruder]]> elmoret wrote:

You can notch a credit card and slide it in to take up the gap on the E3Dv6's embedded bowden connector.

That's not a bad idea, if i can't get a secure fit with it, I'll make a bigger hole and reinstall the push fit with a spacer.


As for the gearing, i wanted very smooth operation from the stepper.  The slow retractions i can take care of by switching to 8 micro stepping instead of 32, or lower if i have to.  I have read in places that 5 to 1 still wasn't quite enough to eliminate moire.    I didn't have torque problems with the stock motor in the bowden setup, but it was still pulsing even with 32 microsteps.

]]> https://www.soliforum.com/user/3772/ 2014-12-19T20:00:32Z https://www.soliforum.com/post/75883/#p75883 <![CDATA[Re: 14:1 Geared Bowden Extruder]]> Any reason you went with such higher gearing?  Ony my large scale delta I only use 5:1 and its plenty enough to shred filament and also suffers slow retracts.  On a SD the bowden tube is short enough you can probalby get away with just a plain NEMA 17

]]> https://www.soliforum.com/user/414/ 2014-12-19T18:18:57Z https://www.soliforum.com/post/75873/#p75873 <![CDATA[Re: 14:1 Geared Bowden Extruder]]> elmoret wrote:

You can notch a credit card and slide it in to take up the gap on the E3Dv6's embedded bowden connector.

Just running into the same issue CC is a good idea just don't use the one you use at the Filastruder store tongue

]]> https://www.soliforum.com/user/2291/ 2014-12-19T18:17:00Z https://www.soliforum.com/post/75872/#p75872 <![CDATA[Re: 14:1 Geared Bowden Extruder]]> You can notch a credit card and slide it in to take up the gap on the E3Dv6's embedded bowden connector.

]]> https://www.soliforum.com/user/221/ 2014-12-19T18:08:29Z https://www.soliforum.com/post/75870/#p75870 <![CDATA[Re: 14:1 Geared Bowden Extruder]]> Got it all on and running this morning, only issue so far is the ptfe tubing doesn't want to stay in the extruder ha.  There's quite a bit more friction in these tubes than i thought.  I'm probably going to super glue it.  I have push fittings from e3d but they let the tube flick up and down a mm or two, which eliminated my retraction on the previous setup.

It's very slow to retract with 2480 steps/mm, I'll have to fiddle with things until it's a useful speed.  I do have it limited in firmware to 7mm/s though.

The design came out great though, works as planned.  Can't complain for only about 2 hours of total work. I wasted more time last night trying to find songs to listen to.

I have sticky back rubber between the mount and the frame, keeps things quiet.  The only other issue i need to fix is the clearance for the filament.  Might make a floor or bottom of the frame spool holder.


Related pictures:

http://i.imgur.com/VAVWC63.jpg

http://i.imgur.com/hvviYiP.jpg

]]> https://www.soliforum.com/user/3772/ 2014-12-19T17:56:43Z https://www.soliforum.com/post/75867/#p75867 <![CDATA[Re: 14:1 Geared Bowden Extruder]]> A rough version 1.0 is drawn up and printing atm.  Should be able to finish installing it tomorrow.
http://i.imgur.com/VODBKDD.png?1

]]> https://www.soliforum.com/user/3772/ 2014-12-19T08:24:25Z https://www.soliforum.com/post/75814/#p75814 <![CDATA[14:1 Geared Bowden Extruder]]> This tank came in today, so I'm going to draw up an extruder for it and slap it on my doodle.  The gearing is 13.71:1 giving it 425oz-in of permissible torque.  I have the E steps at 32nd's atm, which would give me 2480 steps per mm.  I really doubt I'm going to keep it there, I just want to see what she'll do.  I'll probably tune it back down to 16th's that way it will be basically 14 times my stock resolution.  I shouldn't need more than that to eliminate moire.

Here's a comparison next to the X axis motor:

http://i.imgur.com/Xenq1q6.jpg

]]> https://www.soliforum.com/user/3772/ 2014-12-19T05:02:17Z https://www.soliforum.com/post/75804/#p75804