3 good layers then no succesful print

[long pagoda]

Hello,
I have a new VCore 4 Idex and followed the Comissioning Guide, but I can not get a finished print. The first 3 Layers print beautiful. When the Infill pattern starts the Walls curl up and the infill is not printinting right. I tried changing to different filament, flow, checked if the rotation distance of the extruder was of, printed only with 30mm per second, fan speed from 0 to 100%, changed the Infill type and speed. I tried everything I can think of.
I started with the standard prusa slicer Profile without any success and changed values but it did not get better. The first 3 layers are perfect and print smooth. After those 3 layers the walls curl up, get this weird pattern and the infill is not printing properly.

[onyx scarab]

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[serene yoke]

I am having the same issue apart from I can print a voron cube fine just nothing else. I have tried having my fans at 50%

[final glen]

Hey Kiwi death - you per chance another Kiwi?

[serene yoke]

@final glen I am but I don't live there anymore

[carmine bolt]

pictures are a bit blurry but I think you're overextruding. That infill looks BIZARRE

[mossy steeple]

Having same issue, it looks like under extrusion, but I am not sure.

[tough roost]

Printing too fast for a vCore4 IDEX here is a setting i use that helps, spent hours running speeds and acceleration to get consistent prints

i have been doing a ton of work and testing to determine an optimal tension to speed optimization settings

tools used:

• BIQU Belter /w printed tip

Machine:

• RatRig vCore4 400mm IDEX

Findings:

• 10k acceleration and 600mm/s is where the issue seems to arise where the toolheads will move at high speeds off their X0/X1 homes when rapidly moving the Y axis

Solution findings:

• Using the BIQU Belter adjusting all belts while in the 0 position to -6.5 to -7.1 ensuring they all match
• by reducing the max accel to 8k and max speeds to 500mm/s the X0/X1 jerking motions seem to have been eliminated though more testing is required

While i dont have a Hz measurement tool these settings seem to have helped in the machines consistent movements

[frank yew]

"fan speed from 0 to 100%" as in you've tried no cooling or thats the min/max? My initial thought is overcooling for the set temp. The fan at 100% is cooling the tip enough to cause under extrusion. UHF is great but it also adds a considerable distance from the tip to the heating element. The silicone sock can only do so much.

[long pagoda]

Sorry for the late answer from my side. It is extruding nicely now. The problem was the standard nozzle. I never crashed into the bed or similar. I baught a new one and it extrudes perfectly fine now.

However I have bad layershifts after some layers. I am trying to get the belts right but it is not working for me. I looked if they are not the same length and tried to tention them several times. But alwais those layer shifts. I think my frame is slightly twisted but when I align the gantry in the back so there is no play, I have play in the front. I have a belt tention graph that as far as I can tell is ok. Maby somebody can help me

[long pagoda]

Now i did a new belt tention mesurement and did not change anything at all... Different graph for y....

[long pagoda]

I got news! First successful benchy is printed. The original belts had some give to them. I cant explayn why. I put new ones in and now it is working!