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Feeding filament
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Description

Customer called in having issues with feeding filament. I recommended cutting the filament at a 45 degree angle, and loosening the idler screws until the filament goes through. Customer reported that they were able to get the filament through, but it was still a bit of a struggle.

Here's a video the customer sent in: https://youtu.be/blz9huWHhxM

Event Timeline

nathan created this task.Nov 29 2017, 6:45 AM
kent claimed this task.Nov 30 2017, 12:42 PM
kent added a subscriber: kent.

Hey probably the easiest way to feed filament into the v3 is by cutting the filament at a 45 (liek you suggested) then put it in as far as it will go, then use your thumb and/or fingers to manually advance the large extruder gear. Once the hobb teeth bite on the filament, you should be able to let go of the filament and just feed it the rest of the way through manually with the large gear.

Hope this helps.

In T1386#23670, @kent wrote:

Hey probably the easiest way to feed filament into the v3 is by cutting the filament at a 45 (liek you suggested) then put it in as far as it will go, then use your thumb and/or fingers to manually advance the large extruder gear. Once the hobb teeth bite on the filament, you should be able to let go of the filament and just feed it the rest of the way through manually with the large gear.

Hope this helps.

^This is correct, in fact removing filament should be done by rolling the feed gear back as well. One other thing is because the filament path is curved the cast of the filament needs to match the direction of the curve of the path. if the filament is curved opposite the path it will roll past the bolt and hit the edge of the path. You will need to clock the filament when inserting so the filament curves into the path and not away from it.

@nathan please let me know if this helps. Please respond either way.

@Baldwin Seeing more issues with this. I worked with @TyTh and @bigmansas on this earlier today.

Current Situation

The current suggestions that we have are outlined in Step 22 here: https://ohai.lulzbot.com/project/lulzbot-taz-dual-extruder-tool-head-v3-install/accessories/ Specifically:

Note: If you experience some resistance while inserting the filament, try clipping the end of the filament so it forms a point that's slanted at the bottom. Slightly pull back on the idler arm and insert the filament from a 45 degree angle as shown in images. Once the slanted end reaches the hole, wiggle the filament until it slides in farther. Then, rotate the gear by hand to help pull the filament into the tool head.

Unfortunately the user was not able to get the filament inserted, instead it came out the back of that part of the extruder. It seems the best advice we have there is to try to angle the filament toward the front of the tool head.

Immediate Remedy

First, @TyTh is going to work on improving documentation. This is something @benmalouf and @mcoronado may be able to help with, perhaps converting that FreeCAD export into a GIF or illustrated static image of some kind.

Possible More Extensive Fix

In the meantime, we should evaluate whether an ECO may be required to at least prevent that filament from feeding out the back of the extruder.

@DRobertson is working on a few images to highlight and show where the filament actually needs to go. They will be uploaded when finished.

@glatti Is it possible to add this to step 22 on the aforementioned OHAI, when completed?

@TyTh absolutely. Will update when ready

@kenhara During development there was a feature to prevent that exact thing. However in some cases the feature interfered with the tension mechanism not allowing the idler to close fully. The feature was removed because that can cause stripping out of the filament. Also, you can always unscrew the tension screw, open the latch and insert the filament. However, this would require a slightly smaller spacer to set tension with. We decided to model the tension spacer to set tension before filament is inserted because with varying durometers of filament it would easy to over tighten if tensioned after.

TyTh added a comment.Dec 1 2017, 1:03 PM

@glatti The files are at :
Highlighted path:
/home/aleph/shared-j/Documents/Creative/Photo/Documentation_Photos/Ohai-kit_source_photos/Dual_V3/FilamentInstallGif/filament_path_Highlighted.png

Gif of path:
/home/aleph/shared-j/Documents/Creative/Photo/Documentation_Photos/Ohai-kit_source_photos/Dual_V3/FilamentInstallGif/filament_path.gif

Thank you @DRobertson !

@TyTh thanks! The gif has been inserted before the detailed steps, with a note about the filament path being altered to make v3 more compact: https://ohai.lulzbot.com/project/lulzbot-taz-dual-extruder-tool-head-v3-install/

Steven added a subscriber: Steven.Dec 1 2017, 3:54 PM

@glatti I think we need to enter into the Ohai that if there are issues then loosening the idler would help inserting filament.

Can we get a 1920x1080 render of the filament path for use in video?

@DRobertson Will this work for you?

@Baldwin That will do the trick. Thank you!

karrad added a subscriber: karrad.Dec 11 2017, 9:42 AM

@DRobertson @kenhara Do you guys need anything else on this one?

@karrad I'd like to leave this ticket open for the time being. One additional piece of work on this is a new video that will be published shortly online.

However I want to keep this open until we get confirmation from @nickp @TyTh and others in Tech Support that we have addressed this issue through the changes to both the OHAI and this instructional video. I feel like closing this now may be pre-mature.

Are you okay with this?

I think the video and the updates to the OHAI are as clear as we can be for feeding into the v3. I am interested in hearing feedback from customers once it goes live.

I agree, the between the video and the OHAI there's not much else we can do. Like Josef, I'm interested in hearing what customers say (if anything) after these go live. They both look fantastic!!

Okay thanks all! In terms of other options, just throwing ideas out there (though I do not believe they are needed at this time), we could:

  • Include detailed documentation in the box
  • See if differently designed jigs might make this easier
  • Look at some kind of re-design, ECO, or some hardware change

Again, not saying they are needed, just saying if we should keep an eye on it in case this documentation does not fix the issue. Thanks all!

karrad reassigned this task from Baldwin to nickp.Dec 13 2017, 12:00 PM
karrad triaged this task as Normal priority.

@kenhara Absolutely no problem leaving this one open for now.

@nickp I am assigning this one to you, feel free to update or close when you feel enough community feedback has been gathered.

karrad reassigned this task from nickp to lansky.Jul 2 2018, 10:21 AM

@lansky With the new gif and strategies for the V3 dual, do you have anything else you would like on this end?

@karrad Looks good to me.

karrad closed this task as Resolved.Jul 3 2018, 11:21 AM