VCore4 500 hybrid 2nd layer major over extrusion

[hearty mason]

I've been trying for a few days to print a bumbag and now have a solved my first layer issues enough to try the whole print. Shortly after the 2nd layer began, I'm getting this crazy over extrusion. A few blobs I can deal with but this is unusable. I can't decide if this is a Z issue, slicing, or flow calibration. I also don't know how to confirm if I have one of the faulty earlier release rapidos but that crossed my mind. Any suggestions would be appreciated.

Printing in PLA with the rapido 2 uhf .6 nozzle for now. Dried it yesterday for 5 hours in sunlu s4. (Petg later if I like my layout)

PID tuned the nozzle, did cold and hot meshes. Print was started after ~30 min preheat at 70c

210 nozzle, 65 bed. Did flow and PA tuning. Using 36mm/sec on flow, 1.012 was my extrusion multiplier.
Fan at 20% for first layer and I tried going up to 60% before I cancelled the print. Didn't notice any reduction in the blobs.
Max accels are 6k for Y, 15k for X.
Sliced in PS

[sleek oriole]

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[hearty mason]

VCore4 500 hybrid 2nd layer major over extrusion

[thorn totem]

Flow seems high. Like snoop dog high.

[hearty mason]

I guess first layer is just rolling the blunt

[hearty mason]

Tried again - First layer is great

But 2nd got weird and it outright stopped extruding half way into the 3rd layer

[hearty mason]

Filament path for reference

[obsidian gorge]

try lowering the flow to 28mm or 30

[blissful bobcat]

1. What is your extrusion multiplier for this filament? Have you calibrated it for this filament? Iirc I have 92%. Relatively low figures are common with this setup.

2. Thermal/bimetallic gantry bowing can kick in during early layers - typically between about 15-30 minutes into the print if the gantry was not pre soaked. Are you heat soaking?

Ok, I read now that you have extrusion multiplier >1. This seems very unlikely unless your filament is undersized. Also ensure that the orbiter tension is only as tight as it needs to be to pull filament against finger squeeze resistance grabbing the filament. Super high tension will cause problems. I also agree with @thorn totem that your flow seems aggressively high,I would dial that back to 25 until you get the other issues sorted.

[hearty mason]

Appreciate the suggestions, I had intended to try reducing flow, so I'll do that first. I was a little surprised that my multiplier was nearly 1. I'll redo that as well. Also going to add a spool roller tomorrow after I get some more bolts.

[thorn totem]

Put .95 in the extrusion multiplier/flow box. It'll probably clean right up

[shy token]

This is not over extrusion but quite the opposite. 36 flow might be too high for your setup specially when printing at 210c. Have you done flow rate test to find your max?

[hearty mason]

i'm going to try again reducing max flow to 25 to see how it goes with the 210c, hopefully i have enough time today

[hearty mason]

Changed to 25 on max flow and landed at 205. Started well but about half way through first layer, extrusion weirdness began.

I reduced extrusion to 98% and dropped temp to 205 and it started to normalize. You can see the change on layer 2 on the left. Am I still dealing with flow issues from my slicer or is this more of a hotend issue now?

[shy token]

You probably need to increase the temp not reduce it. What you see here is most likely the core of the filament is still not 100% melted and not sticking to the previous layer. Even if the print finished without issue at this temp, it will look matt and will break easily

[lofty sundial]

Hello do you found a solution ?

[hearty mason]

Not yet. I'm in the middle of upgrading to idex and a new set of hotends. I'll see how it goes in a few days hopefully

[lofty sundial]

I think I have the same problem

[lofty sundial]

Random unterextrusion

And if I go higher then the next print is is too much

[hearty mason]

I don't have evidence to back it but I'm really wondering if it's the rapido having inconsistent temp issues

[lofty sundial]

Yes maybe I don’t know
What setup do you install now ?

I thinking of to buy a new extruder + hotend

Or only hotend

What do you buy ?

[hearty mason]

Rapido ace uhf with pt1000

[lofty sundial]

Looks really nice

[lofty sundial]

And the orbiter ? Do you change them too