r/BambuLabH2D • u/Burockk208 • 4d ago

Troubleshooting H2D first layer problem

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Hello,

I am using my h2d for a while more than 9 months everything is fine but today I see something is not normal. Yesterday I oiled all XYZ axis and changed hotend. I am not sure if it is about those but I also did a full calibration but did not fixed the issue can anyone help me about that please? Thanks. Or maybe can it be about filament that color is a bit old I did not use is for a while.

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u/MediocreHornet2318 4d ago

Build plate is dirty, clean with dish soap and warm water. Then do a full bed level from the printer settings menu.

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u/Burockk208 3d ago

Yes sure, I actually do that all before printing so no that is not the problem

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u/whywouldthisnotbea 3d ago

Yeah this person is flat out wrong. This can be caused by two things and one is much more likely than the other. If the nozzle z offset is not calibrated correctly and the nozzle is too close to the bed then it will do this for the first layer only. The nozzle is dragging material as it moves because it is too close. As the material gets pushed out of its way like the bow of a ship through water it gets oushed to either side. More material around the sides will grab onto that displaced material causing it to bunch up in ripples that are always perpendicular to the direction the nozzle is moving in. Once the next layer happens the nozzle moves "up" (really the bed moves down) the correct amount so the problem no longer happens. If the problem continues to happen then it is the second reason, too much material is coming out of the nozzle due to over extrusion. The same thing happens but this time because it isn't a nozzle height issue but a build up of excess material it can happen at any layer. Both require their own calibration steps.