esun petg

[jdacal]

pet likes to clump on the nozzle if its not printing right. any of the guys who used the pet+ know all about that. looks to me like your support and raft material wasnt staying completly stuck down smooth and your nozzle keeps dragging though it slowly collecting. i was just on another forum and some else posted this exact same thing but with pla. they must have posted the exact same time as you...weird coincidence i guess. dont go tuning your pet profile though due to that raft. layer heights arent normal for rafts and the layer that goes on it which would be your support. this is why the ends of the lines are curling up and collecting on the nozzle. if the layer heights were the same as your model then the raft would be bonded to the part.

What you described happened to me on my first print with the blue last night. I touched up the Z adjustment and cleared it up. But yeah, it had like a 3 ton gob of filament build up on the nozzle. Biggest one I've ever seen!

[sprior]

What do you mean you "touched up the Z adjustment"?

[jimc]

yeah tim is a real pro at that one. haha.

[jdacal]

What do you mean you "touched up the Z adjustment"?

The Z axis adjustment bolt. The nozzle was a little too low and was rubbing against the print. Just barely, but enough to build up filament on the side of the nozzle as it moved across the print. I readjusted the gap between the nozzle and bed with the Z adjustment bolt to .005" and it cleared up.

I'm actually seeing a little build up on the nozzle on the print I'm doing now so I guess its REALLY picky about that, might have to touch it up a little more.

[jimc]

You can do that if your seeing it happen during the first couple few layers. If it continues through the whole print then your probably overextruding a touch. Just bump down the multiplier a little.

[jdacal]

Can that be done while its printing? You mean through control panel? What's the code for that? Maybe I'm not understanding correctly what you mean.

[jdacal]

I think it was just the few first layers like you said. I just went and looked at it and doesn't seem to be growing.

[jimc]

Sure you can do it while printing with dial control on the control panel. Sounds like you verified its the first few layers which just means the bed gap is too tight.

[Tim]

Has anyone run a calibration print on the petg? I switched over to my yellow spool yesterday evening (which is perfectly well within tolerance, by the way---I seem to have been the only one to get a bad spool from the entire shipment, so maybe we can chalk that up to somebody having dozed off briefly during inspection), and printed a set of filament spool clips and dust filters. The holes in the filament clips are supposed to fit 1.75mm filament, but the inside diameter came to about 1.58mm. The hinge on the dust filter (this is the one with the hinge that prints in place) was on the stiff side. On one of my two filters, I got the hinge working by bending it with pliers. The other one broke across the hinge arm when I tried the same thing. As an aside, though, note that I put a LOT of force on this delicate little print with two pairs of vise-grip pliers. This stuff does live up to its reputation for toughness. And like Jim mentioned early on in this thread, the one that broke did NOT break along a layer line. It broke across all the layer lines, like the layers didn't exist.

Anyway, the tolerances either mean that I have the temperature too high, so it's a bit more "melty" than it needs to be, or my extruder multiplier is off, or maybe a bit of both. I think the temperature is about right, though. It didn't show any drooping or any of the usual symptoms of being too soft. So I'm going to run a calibration print and see what the extruder multiplier needs to be set to.

[Tim]

My calibration test print says I need to have the extruder multiplier set way down around 0.85 or so. Can anybody else duplicate this result?

Post-edit: I should not say "way down", as the value for PLA is around that value. I have had the value 0.88 plugged in for PLA for a long time. Plus there's a pretty large margin of error for that 0.85 value.