Voron 2.4 R2 problem height of the printed models

General Discussion
1

Basic Information:

Printer Model: Voron 2.4 r2
MCU / Printerboard: Manta MP8 v2 + CB1
klippy (4).log (70.2 KB)

Hello everyone! Help me solve the problem with the height of the printed models! The printer is Voron 2.4 r2 slicer Orcaslicer.
For some unknown reason, the models turn out to be taller than required! The height can be different, usually 0.2 mm higher. I even printed 10 models at the same time and their height became even more than 1 mm. At first I thought that the problem was with the printer mechanics! That’s why I checked everything and calibrated it 2 times (belts, gantry) It’s very strange that you can print one part many times and they will always be the same height! That’s why I think everything is fine with the mechanics! Maybe something is wrong with the Klipper! I don’t know what to think anymore! Help me with advice on what else to check!

2

I did a test! I printed this model 3 times. I’m giving a photo of the test print, the dimensions are shown in red! That’s how much the part has become taller!

Test_hight_1
Test_hight_12920×1056 120 KB

Map_Test_hight
Map_Test_hight3387×1314 308 KB

3

as soon as I turned off the grid! it got better! the detail became 0.2 mm lower in height
then I don’t understand:
if I turn on the grid, my table curvature is about 0.2 mm Klipper should level this error by making changes to the layer height inside the model! but why do all the flat planes become 0.2 mm higher I don’t understand

4

as a result I got the exact height of the model:

  1. I changed the height of the first layer in the Orcaslicer and set it to 0.2 mm so that it would be an even value, since with a print layer height of 0.2 it cannot normally calculate the height of the upper plane and makes it +0.1 mm!
  2. I deleted all the grids from Klipper
    I printed the model again and all the dimensions turned out absolutely accurate!
    good
    good1920×439 67.7 KB
5

Now I’ll try to turn on Bed Mesh and see what happens!

map_new
map_new3385×1301 298 KB

made a new mesh grid!
printed the model again!
all dimensions are perfect!!!
looks like the problem was in the Orcaslicer!

6

The story continues!!!
I printed 6pcs of these parts! According to the Orcaslicer, the height should be 16.5 mm. In the end, it turned out to be 17.1 mm, which is 0.6 mm more, strange! There are 6 parts and the height increased by 0.6, i.e. 0.1 for each added part!!! I’m horrified!!!

1
12153×1094 447 KB

2
21920×1527 207 KB

7

Now I’ll try to print the same code without the Mesh grid!!!
let’s see what happens

8

3
31867×1817 193 KB

without a grid the result is excellent!
it turns out the whole problem is in the grid!!!
and why does the number of models on the table increase the height even more???

9

I turn on the grid again!
and print 3 pcs.
let’s see the result!!!

10

4
41920×1297 160 KB

the problem is definitely in the grid!!!
why does it increase the model by 0.5-0.6 mm???

11

I have a solution but it won’t suit everyone!)

20241108_201825
20241108_2018251920×887 249 KB

20241108_202001
20241108_2020011920×887 251 KB

12

This is a joke) but the problem remains!!! Maybe someone knows why turning on the Bed mesh grid can increase the height of the model???

13

read mesh fade

Fade also may have some undesirable traits, if you fade too quickly it can result in visible artifacts on the print. Also, if your bed is significantly warped, fade can shrink or stretch the Z height of the print. As such, fade is disabled by default.
14

of course I read the fade instructions
they should be off by default!!! but now I tried to enter the value manually to turn it off and I want to see the result! the model is printing now!

5
53410×1115 308 KB

15

6
61920×887 94.1 KB

No, unfortunately it didn’t help! +0,5mm hight

16

I don’t know what to think anymore(((maybe the problem is in the Klipper version???

17

new day, new theory) I was thinking and analyzing here!
i turn off fade manually, changed the settings in the config, but did not build a new grid! when printing I used the old saved grid!
I will now try to build a new grid and record a full video of printing!

18

+0,4 hight. I’m very upset!!! Now I’m even more confused!!!

20241109_153350
20241109_1533501920×887 106 KB

19

map
map2732×1264 246 KB

1 layer
1 layer1379×1307 161 KB

83 layer
83 layer1375×1307 151 KB

now I will send a photo of the first layer and the last layer! request for height and actual height, it says that everything is fine!!! but in fact +0.4 mm to the total height! I don’t know what to do next(((

20

Let me remind you that as soon as I turn off the Bed mesh grid and start print the same model, the height is absolutely accurate!!!

[bed_mesh]
speed: 200
mesh_min: 30, 20
mesh_max: 320, 300
probe_count: 25, 25
algorithm: bicubic
fade_start: 1
fade_end: 0