Under extrusion after first layer | Rat Rig Community [Unofficial] | Page 1

robust walrus Oct 15, 2025, 1:59 PM

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Hi. I am printing with the V-core 4.0 500x500 IDEX + Hybrid on single print head mode. For some reason the printer starts under extruding after first layer. The first layer comes out really nice, but immediatly after the following layers look horrible. Doesn't look like it's a clog as the first layer is nice and priming blob is coming out fine. If you listen closely you may hear some weird noise when its doing long movements, not sure what that is. Just did a Beacon calibration and bedmesh before the print. The filament i am using is prusament PLA galaxy black. and the corresponding prusament pla filament preset in prusa slicer with 0.2 Quality and 0.6 mm nozzle. unsure why this skew calibration prints so weird. Tried printing it twice with same results.

I have followed the commisioning guide except, Belt tensionioning guide. As i understand it, this is only for corexy/Hybrid and not IDEX.

carmine berryBOT Oct 15, 2025, 1:59 PM

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robust walrus Oct 15, 2025, 2:12 PM

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Under extrusion after first layer

ocean spire Oct 19, 2025, 8:38 AM

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Have you tried taking the filament tube out the print head and pulling some filament through to make sure it moves easily and smoothly. Could be pinched with a cable tie or something and when the print speeds up it cant follow.

robust walrus Oct 20, 2025, 8:02 AM

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ocean spire Have you tried taking the filament tube out the print head and pulling some fila...

Yes we tried that. The filament is not being pinched by the tube. have tried around 5 prints with the same result everytime. Also tried tweaking the filament flow and speed with minimal sucsess. Tried both PLA and PETG, both been dried beforehand and while printing

grave pilot Oct 21, 2025, 6:51 AM

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Is there a temperature drop on the nozzle after the first layer? Perhaps the nozzle is too cold for the extrusion rate at which you are printing. Most profiles have a lower print temperature after the first layer. Another point to consider is the cooling, which is usually deactivated for the first layer and activated afterwards. The fan settings could be too high and may also cool down the nozzle too much.

robust walrus Oct 21, 2025, 8:30 AM

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grave pilot Is there a temperature drop on the nozzle after the first layer? Perhaps the noz...

We have narrowed it down to speed and acceleration. When we slowed the entire print down to 60 m/s it worked much better, this is however much slower than the stock. I just noticed the nozzle type is set to CHT instead of regular nozzle. I will try to put it to regular and see if that solves the issue.

grave pilot Oct 21, 2025, 8:39 AM

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Do you use the 0.6 mm nozzle that came with the hot end? I have read several times that the stock 0.6 mm nozzle is cheap and poor quality.

robust walrus Oct 21, 2025, 9:32 AM

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grave pilot Do you use the 0.6 mm nozzle that came with the hot end? I have read several tim...

Yes im using the stock 0.6 mm nozzle. is the 0.4mm nozzle that comes with the box bad quality as well?

grave pilot Oct 21, 2025, 10:19 AM

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The 0.4 that comes with the Hotend is much better. Have printed very good with that but changed it to a 0,4 hardend steel because printing CF material is not recommended with the stock one

#Under extrusion after first layer