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Printing issues ...
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It's difficult to measure correctly when it's not 100% of Z steps but it looks like this distance is approx 2mm in every case.
- by 100% of Z steps- the change is exactly every 10 layers so by 0.2mm it gives 2mm z wobble as imqqmi wrote,
- by 80% also approx 2mm,
- by 130% also approx 2mm.
First I will dismantle the rod and have a close look at it's connection with the motor.
by
icp
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Printing
Ok I will try it and post here the result.
by
icp
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Printing
Heat bed: 0'C
Hot end: 220'C
The same part printed and also PLA.
During printing with cold table the print partly detached from the table but the problem was already visible so I stopped it. It's the left side of the print so let's not get into it.
Overall it looks like exactly each 9th and 10th layer there is a change.
So it looks like we may exclude the bed temperature deviations from the main
by
icp
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Printing
I might have the dial indicator somewhere in the basement. I have to dive in and search.
It sounds possible. Aluminium expands under temperature. Steel spring washers which hold the bed in level are made out of very thin plate. If they heat up they may loose their inner tension as well and the hole bed will lover for a moment. It sounds possible.
I will check the movement steps again to be 100%
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icp
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Printing
Quotethe_digital_dentist
Z wobble offsets the layers so that on one side of the print any given layer will bulge and on the opposite side it will create a concavity, like very small layer shift. That looks more like the layers are not consistent thickness.
Id the bed heated and is it using bang-bang control?
The bed is heated during the print to 60'C and the nozzle is 220'C.
Yes it makes sense
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icp
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Printing
That's right. The pitch is 2mm and printed objects have a step change every approx 2mm of height. Even elements printed with 0.15 and 0.10 mm also around 2mm. It all ads up to your conclusion.
I will replace the long nut or maybe the rod as well.
I will search for sets of threaded rods with nuts meant for reprap. More expensive but if that will do the job then ok.
Thank you imqqmi. I appreciate i
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icp
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Printing
Hi
I am using Felix printers frame with Mendel 90 electronics: Arduino+Ramps 1.4.+Marlin 1.1.9.
I print with PLA.
H-E temp: 220'C.
Bed temp: 60'C.
Speeds: more less standard speeds.
Extruder: E3D-v6 Nozzle: 0.4mm. Primary layer height: 0.2 in this case. Extrusion width (automatic) 0.48mm.
For a long time I cannot handle the problem with sequential layer dimension change every approx 10 layers
by
icp
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Printing