Since you said to “forget that number” I did some trial and error on the Z-axis. I think I finally got it right the lines are now perfectly “pushed” on the bed and don’t jump up anymore. And they are not spread out so normally the nozzle isn’t to close to the bed. I think this height is much much lower than the 0,25 mm that Velleman suggests. But hey I finally get a good first layer.
There is only 1 thing I worry about a little bit. When a layer is completely filled, the nozzle goes back to a corner, often crossing the layer that is just printed. When it does, it leaves a small scratch on the surface. (Which would mean the nozzle is too low). But I don’t get that. It prints a layer and when the nozzle goes over that layer on the same height it touches it? How is that possible? Still, the quality is now better then ever before. Should I raise the Z height a slight bit or shouldn’t I worry about this?
I think this may be an optical illusion. For such travel moves, there is no retract, so the nozzle oozes a bit and leaves a very thin line of material on the surface. As long as this surface is afterwards covered by another layer this is ok, but for the top layer Slic3r should not produce such travel moves.
The relevant setting is “Only retract when crossing perimeters” (default: on). Switching off causes the extruder to retract for those moves, but also in many situations where it’s not necessary, slowing down the printer.
Ok, then I’ll keep this height for future prints. The plate that failed before is now printed. Before I found this ideal height, I printed the same plate with 10% fill, which gives less material, less tension. The plate did not warp that time. I think with this print height it might even work with the 25% standard infill. But I’ll leave the plate like this for now thanks for your help the past few days kuraasu, you really helped me out
the lines are now perfectly “pushed” on the bed and don’t jump up anymore. And they are not spread out so normally the nozzle isn’t to close to the bed. I think this height is much much lower than the 0,25 mm that Velleman suggests. But hey I finally get a good first layer.