SoliForum - 3D Printing Community — 14:1 Geared Bowden Extruder

Re: 14:1 Geared Bowden Extruder

null@example.com (accusedmonk) — Fri, 19 Dec 2014 20:00:32 +0000

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.

Re: 14:1 Geared Bowden Extruder

null@example.com (timp610) — Fri, 19 Dec 2014 18:18:57 +0000

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

Re: 14:1 Geared Bowden Extruder

null@example.com (wardjr) — Fri, 19 Dec 2014 18:17:00 +0000

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

Re: 14:1 Geared Bowden Extruder

null@example.com (elmoret) — Fri, 19 Dec 2014 18:08:29 +0000

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

Re: 14:1 Geared Bowden Extruder

null@example.com (accusedmonk) — Fri, 19 Dec 2014 17:56:43 +0000

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:

Re: 14:1 Geared Bowden Extruder

null@example.com (accusedmonk) — Fri, 19 Dec 2014 08:24:25 +0000

A rough version 1.0 is drawn up and printing atm. Should be able to finish installing it tomorrow.

14:1 Geared Bowden Extruder

null@example.com (accusedmonk) — Fri, 19 Dec 2014 05:02:17 +0000

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: