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Can not make BLTouch to work properly


Kichaa
(@kichaa)
New Member Registered
Joined: 2 months ago
Posts: 3
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Recently I bought legit Antclabs BLTouch v3.1 for my Ender 3 Pro because i have enough with calibrating bed manually. Connected it to 4.2.7 silent board which got FirmWare updated to 1.1.2 w/o transfer board" from creality site (connected BLtouch properly to dedicated onboard socket) just before and after running it up and setting my Z offset for probe I started test print. For me it looks like problem is probe z offset does not apply or bed level probing was not applied to print but I am not sure is it really a problem and not if it is something else so i will not argue. This is my first printer and first time using bltouch.
Then I learned how to, compiled and flashed newest 2.0.X-bugfix FW straight from Marlin, same bad result (you can see it in gallery bottom of post on example test print).
Then I tried to use "27 pin board" remembering to switch pins for GND and VCC with flashing proper FW from Creality for that (1.3.1 with transfer board), same bad result (you can see it in gallery bottom of post on example test print).
I searched different forums, saw couple marlin github topics, nowhere to found any explanaition what is going on nor what to do.
I am pretty sure printer is not the problem. Eccentric nuts are tight, but not too tight and Z/Y axis don't wobble. Leveled X axis so it is the same height on both sides to top/bottom with one of CHEP's video. Have aluminium extruder, yellow springs. Everything was working almost great (only problem was warping on big prints) before, besides i needed to level bed too often for me, like once per few days, so i decided to get bltouch.
Please help.

Here is my bed mesh level.
_____0______1______2
0 +0.028 -0.027 +0.024
1 +0.049 +0.005 +0.050
2 -0.031 -0.046 +0.014

As You can see BLtouch should compensate it without a sweat.

I am using newest Cura (4.9) with that start G-code:

M280 P0 S160 ; BLTouch alarm release
M140 S{material_bed_temperature_layer_0} ; Set Heat Bed temperature
M190 S{material_bed_temperature_layer_0} ; Wait for Heat Bed temperature
M104 S120; start warming extruder to 120
G92 E0 ; Reset Extruder
G28 ; home
G29 ; auto bed leveling
M104 S{material_print_temperature_layer_0} ; Set Extruder temperature
G1 X0.1 Y20 Z10.2 F5000.0 ; Move to start position
M109 S{material_print_temperature_layer_0} ; Wait for Extruder temperature
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X1.1 Y20 Z0.2 F5000.0 ; Move to start position
G1 X1.1 Y200.0 Z0.2 F1500.0 E15 ; Draw the first line
G1 X1.4 Y200.0 Z0.2 F5000.0 ; Move to side a little
G1 X1.4 Y20 Z0.2 F1500.0 E30 ; Draw the second line
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X5 Y20 Z0.3 F5000.0 ; Move over to prevent blob squish`

Tried to add S420 S1 at the end or after G29/instead of G29 does not change anything either.

Here is link to gallery to example test print which shows unevenness:
https://imgur.com/a/SDGJgZx
It was printed in that order: back left -> center -> back right -> front right -> front left

ABL's probing starts in front left and goes towards right then one row back and goes to left, another row back and towards right which is last point.


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kevin
(@kevin)
Prominent Member Admin
Joined: 5 months ago
Posts: 900
 

@kichaa I think there is an adjustable range for BLtouch working, maybe your bed is out of flatness too much that the BL-touch can not make up for it. Have you checked the bed by a ruler?


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Kichaa
(@kichaa)
New Member Registered
Joined: 2 months ago
Posts: 3
Topic starter  

@kevin That's why i attached probed mesh level:
_____0______1______2
0 +0.028 -0.027 +0.024
1 +0.049 +0.005 +0.050
2 -0.031 -0.046 +0.014


Bed is close to be leveled properly and do wont need BLTouch to print fine at all. If you have doubts, points 00, 02, 11, 20, 22 relates to places where test print circles was printed.

This post was modified 2 months ago 2 times by Kichaa

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