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extruder cap crooked
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Description

I noticed the extruder cap doesn't seem to sit flat/straight. I haven't spotted the issue yet, I don't believe any wires are being pinched as far as I can tell.

Event Timeline

logan created this task.May 24 2019, 9:16 AM
logan created this object with edit policy "LulzBot Hardware Products (Project)".
logan added a comment.May 24 2019, 9:51 AM

I disconnected the extruder and put the cap back on without the cables underneath and it still looks crooked, so I don't think it is interference with any cabling.
A quick assembly of the two parts in FreeCAD doesn't show any interference either:


I did notice however that one of the screw holes is filled, this doesn't show up in the slice though. Just something to keep in mind should we need to make any changes to the cap in the future.

interesting. i didnt notice that on the two units that were over here

logan added a comment.May 24 2019, 9:55 AM

It is slight, but more noticeable when the tool head is at the home position, you can see it against the top frame extrusion.

logan added a comment.May 24 2019, 9:55 AM

It is a bit difficult to get a good picture of it.

adam added a subscriber: adam.May 24 2019, 10:00 AM

The UL printer isn't bad, but just noticeable when homed.

adam added a comment.Jun 26 2019, 10:32 AM

Has this been resolved or addressed? Did we see this more in the betas?

logan added a subscriber: MikeR.Jun 28 2019, 12:52 PM

I did not get eyes on most of the betas, @MikeR did you happen to notice this while you were calibrating redgums?

logan assigned this task to west.Jul 1 2019, 12:41 PM

On the beta I am assembling now this is still visible, naturally. @west any ideas?

west added a comment.Jul 1 2019, 1:32 PM

We could intentionally pad the left side so that it would sit flat

logan added a comment.Jul 1 2019, 1:37 PM

Yeah I'd like to avoid further changes to the carriage parts, we intend to drop to finish verifying those this week. The cap I think can change without having to drop because it is more cosmetic and less structural. @adam does that sound reasonable?

Intentionally padding the left side sounds reasonable to me, this would also effectively ensure the cable connector isn't pinched. I can't find where anything is pinched so I'm uncertain why it has a crooked appearance to begin with. We may want to pad the rear as well, it kinda dips down at the back and left with the front right side of the cap being the highest point.

adam added a comment.Jul 1 2019, 2:14 PM

Sounds fine to me. @logan can you get @west some measurements or estimates for padding?

logan added a comment.Jul 1 2019, 3:20 PM

@west your best guess is as good as mine, I placed a washer under the cap at the back and left fasteners and it didn't look much different. Maybe try 0.5 to 0.75mm increase in those areas and see how it looks?

logan added a comment.Jul 3 2019, 9:08 AM

@west I think I figured this out, at least on the beta at my desk. After removing the cap/extruder I noticed that the X-Carriage Cover wasn't sitting level on top. I loosened the Carriage Cover and the fasteners that secure the X-Carriage to the X Double Bearing Holder and pushed the X-Bearing Holder to the left. I then tightened the fasteners and the cover. Now the complete assembly looks straight with the extrusion when at Z-Max.

Any one else that could try this on their beta?

logan added a subscriber: bigmansas.Jul 3 2019, 9:19 AM

This corrected the cap on the beta at @bigmansas's desk also

west added a comment.Jul 3 2019, 9:20 AM

This could be a fix

west moved this task from Report Issues Here to Beta on the Redgum board.Jul 3 2019, 9:23 AM
west added a subscriber: karrad.Jul 3 2019, 9:44 AM

@karrad who else has betas so we can try this?

adam added a comment.Jul 3 2019, 9:46 AM

T6222 for beta tracking
R&D should have some in Angie's cluster; Sales and TSR each have one as well.

logan closed this task as Resolved.Jul 8 2019, 1:34 PM
logan moved this task from Beta to OHAI Content on the Redgum board.

I went ahead and included this as part of final assembly, I think this will resolve the crooked cap issue.
See step 7 here: https://ohai.lulzbot.com/project/final-assembly-taz-workhorse/taz-workhorse-edition/

No changes to merge, will reopen if this method fails as we work through another 15 betas

west added a comment.Jul 8 2019, 1:35 PM

sounds good to me

logan claimed this task.Jul 8 2019, 1:58 PM