What S3D setting causes this?

[BigBadBry]

Thanks for taking a look at the factory File, and of course, for the tweaks.

The first layer went down pretty well, except for the heavy glob at every starting point (which I managed to squish down with a heated putty knife before the head came back around and hit it)

https://www.dropbox.com/s/ljdobkng9imv2 ... 3.jpg?dl=0

The next few layers seem to go down pretty well, right up until it began laying down infill; which ended up pulling up on several passes and clumping around the nozzle (and dropping randomly)

https://www.dropbox.com/s/f0fq2c1to80dh ... 0.jpg?dl=0https://www.dropbox.com/s/5bsl7qtp531c2 ... 5.jpg?dl=0



I feel like were so close! but then again, I feel like completely random variables come out of nowhere to much it all up again. seriously, I think I have better quality prints on Wednesdays and Sundays, and when the moon is nearly full. This stuff is going to make me superstitious...

[jimc]

ahhh somethin just aint right. its like you have massive back pressure issues and it cant push the filament out so when it makes a jump you just get tons of oozing and blobs. some places look way over extruded and others are under extruded. if it were my machine the first place i would start would be to take the hot end apart. do a cleaning on the barrel and nozzle. the v3b hot end loves to get tight when you swap filaments too many times. it could be part of the problem and why things are inconsistent. its not bad thing to do anyway and atleast you'll know. once that is done i would do a test print again. if its has not improved then you need to increase retraction and coasting. i run an e3d so my settings for that are going to be different. right now you are set where mine are and i know the v3b is usually double what the e3d is. you probably want to have retract and coast more like it would be with abs. try retract around 2.4 and coast around 2mm. you may even need a neg restart distance adding in there. -.05 to -.1.

[ednisley]

completely random variables

Have you checked that the filament drive gear is firmly attached to the gearbox shaft?

If the little screw holding it in place comes loose, retraction stops working. Of course, the screw doesn't suddenly come completely loose, so the print quality gradually declines while everything else remains unchanged.

Draw a line across the end of the shaft and the gear, then do several forward and reverse manual extrusions. If the shaft moves relative to the gear, you've found (another!) problem...

[BigBadBry]

So I took the hot end apart and cleared the long tube and nozzle as best as I could. For the sleeve I used the butt-end of a drill bit, which was a pretty tight fit. The nozzle wasn't quite as easy to clear and I never got all of the black resin out of there, but after putting it all together, it did stream filament much more smoothly in open air.


I then tried reprinting again and by and large, it looked MUCH better, right up until the infill began. As before it just didn't stick to the base layer, but rather pulled away and stuck to the head instead.

Here is the print where it began losing it grip
https://www.dropbox.com/s/sz9dfdjv871wu ... 9.JPG?dl=0


Here is the head, which was kind enough to carry my extra filament for me (notice the drips coming down from the outside, those are new!
https://www.dropbox.com/s/phm38ey29vkec ... 1.JPG?dl=0


Here is a screenshot of my infill settings
https://www.dropbox.com/s/dfxhsh9bkqx6f ... 9.png?dl=0


and this is my speeds
https://www.dropbox.com/s/kcz8uql41u0vr ... 6.png?dl=0

[BigBadBry]

Also, I am thinking about picking up an extra head, would I be better served by picking up a V4 and nozzle, or just another V3b?

[insta]

Also, I am thinking about picking up an extra head, would I be better served by picking up a V4 and nozzle, or just another V3b?

You can't just casually pop out a V3b and pop in a V4. The V4 upgrade is better in every way than the V3 setup, but its an actual upgrade to the machine.

[BigBadBry]

Oh I see, I spotted the upgrade kit, I presume once you upgrade, my current V3B becomes extinct and unusable?

[jimc]

the only thing i can think of, and someone with the v3b will have to chime in, is that the v3b cant flow the 150% of filament through the hotend which you have set for the infill. have you tried lowering that infill width back down to 100% to see what happens? i cant imagine not being able to flow that amount but you never know.

correct on the v4 upgrade. once its done you wont go back to the v3b at all.

[BigBadBry]

Those infill beads are really skinny. When I shoot the nozzle in the open to clear it out, it throws out material at an alarming rate, so I doubt there is a limitation from the nozzle at 150%. Maybe the print head speed needs to slow down for infill? 70% Seems pretty slow already but judging by how skinny that bead it, its just (obviously)not enough to get good surface contact.

[jimc]

whats your layer height and extrusion width set to.