Having problems with Anycubic Kossel Linear Plus calibration

SnakeSP

@veti said in Having problems with Anycubic Kossel Linear Plus calibration:
7:03:57 PMM122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 2.0(RTOS) running on Duet WiFi 1.02 or later
Board ID: 08DGM-9T6BU-FG3SW-6J1FG-3SS6L-KBTHH
Used output buffers: 3 of 20 (15 max)
=== RTOS ===
Static ram: 28380
Dynamic ram: 95920 of which 16 recycled
Exception stack ram used: 372
Never used ram: 6384
Task NETWORK ready, free stack 396
Task HEAT blocked, free stack 1256
Task MAIN running, free stack 3624
=== Platform ===
Last reset 00:18:40 ago, cause: software
Last software reset at 2019-09-01 18:45, reason: User, spinning module GCodes, available RAM 6384 bytes (slot 1)
Software reset code 0x0003 HFSR 0x00000000, CFSR 0x00000000, ICSR 0x0041f000, BFAR 0xe000ed38, SP 0xffffffff
Error status: 0
Free file entries: 9
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest block write time: 0.0ms
MCU temperature: min 56.2, current 56.4, max 56.6
Supply voltage: min 23.2, current 23.9, max 24.3, under voltage events: 0, over voltage events: 0
Driver 0: ok, SG min/max not available
Driver 1: ok, SG min/max not available
Driver 2: ok, SG min/max 75/194
Driver 3: ok, SG min/max not available
Driver 4: standstill, SG min/max not available
Date/time: 2019-09-01 19:03:55
Slowest loop: 174.92ms; fastest: 0.08ms
=== Move ===
Hiccups: 0, StepErrors: 0, LaErrors: 0, FreeDm: 228, MinFreeDm 213, MaxWait: 0ms, Underruns: 0, 0
Scheduled moves: 56, completed moves: 53
Bed compensation in use: none
Bed probe heights: 0.000 0.000 0.000 0.000 0.000
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
Heater 0 is on, I-accum = 0.1
Heater 1 is on, I-accum = 0.2
=== GCodes ===
Segments left: 1
Stack records: 2 allocated, 0 in use
Movement lock held by null
http is idle in state(s) 0
telnet is idle in state(s) 0
file is doing "G1 X9.475 Y-40.525 F900" in state(s) 0
serial is idle in state(s) 0
aux is idle in state(s) 0
daemon is idle in state(s) 0
queue is idle in state(s) 0
autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Slowest loop: 3.74ms; fastest: 0.01ms
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0) Telnet(0)
HTTP sessions: 1 of 8

WiFi -
Network state is running
WiFi module is connected to access point
Failed messages: pending 338, notready 0, noresp 0
WiFi firmware version 1.21
WiFi MAC address 4c:11:ae:02:e3:cf
WiFi Vcc 3.33, reset reason Turned on by main processor
WiFi flash size 4194304, free heap 16200
WiFi IP address 192.168.1.37
WiFi signal strength -70dBm, reconnections 0, sleep mode modem
Socket states: 0 0 0 0 0 0 0 0
=== Expansion ===

M122

Veti

@snakesp said in Having problems with Anycubic Kossel Linear Plus calibration:

RepRapFirmware for Duet 2 WiFi/Ethernet version 2.0(RTOS) running on Duet WiFi 1.02 or later

you are using a very old version of the firmware. just to rule out any problems there update to 2.04RC1

but the problems comes down to this? with marlin pla sticks on the ultrabase. with duet it does not?

SnakeSP

@veti Simply put, yes, with Marlin prints were ok, with Duet plastic does not stick (not only PLA, PETG also).
But i'm almost sure this is due to i'm doing something wrong.
Will try updating to 2.04 RC1 today and recalibrate.
Also it may occur that thermistors are configured incorrectly (hotend thermistor is changed from original one, but the bed is the same except changing it to 24V).
Possibly bed or hotend or both produce lower temperature than expected, but not sure how test this. But on the other hand PLA should stick even to cold bed.

Veti

@snakesp said in Having problems with Anycubic Kossel Linear Plus calibration:

lowered nozzele to Z=0 and was hardly able to put paper between nozzle and bed

this means that your offset is wrong btw. if there is space between the nozzle and bed for paper, then z=0 is not z=0 rather something like z=0.1+movement space.

Veti

what thermistors have you configured in marlin?

SnakeSP

@veti
Current Z probe offset is Z15.791, do you mean i should change it to 15.891 ?
It was
5 : 100K thermistor - ATC Semitec 104GT-2/104NT-4-R025H42G (Used in ParCan & J-Head) (4.7k pullup)
in Marlin, but that was original Anycubic thermistor. Same one for the bed.

Veti

that is significantly different.

semitec is B4725 C7.060000e-8

SnakeSP

@veti Yes, you are right, looks like i really need to change B from 3950 to 4725 at least for the bed thermistor, but what about the hotend thermistor? It is different from the bed one. And should i use С parameter?
And about Z offset for the probe: should i change it to 15.891?

Veti

@snakesp said in Having problems with Anycubic Kossel Linear Plus calibration:

And should i use С parameter?

yes without that the B parameter is wrong.

for the offset. what i do is do a first layer print. if i need to adjust it with microstepping to get a good first layer i update the offset with the microstepping used.

SnakeSP

~~The firmware upgrade guide tells to update not only the firmware itself, but DuetWiFiServer and DuetWebControl.~~
~~WHATS_NEW.md for 2.04RC1 says, that compatible files are:~~
~~DuetWiFiServer 1.23~~
~~DuetWebControl 1.22.6 or 2.0.0-RC6 or 2.0.0-RC7~~

~~But i cannot find those files. Can you point me where to get those?~~
And also a question: what is an appropriate order to upgrade firmware? Upload all 3 files to /sys through Settings-General-Upload files declining update offers and run M997 S0:1:2 after that, correct? Will it preserve my network settings or i'll need to connect using usb and terminal to restore those?
Nevermind. Found those:
WiFiServer in 2.0.3 release
WebControl

SnakeSP

Results so far:
updated firmware
changed bed thermistor to B4725 C7.060000e-8
recalibrated with 15.881 (recalibrated Z probe, at Z=0 no paper can be placed under the nozzle)
tried printing

190C 50C babystep=0 - no sticking to bed at all
190C 50C babystep=-0.5 - partially sticking, corners not sticking
190C 50C babystep=-0.8 - smashed into the bed
200C 60C babystep=-0.5 - better sticking, some corners not sticking
200C 60C babystep=-0.6 - same
But when trying to print at center of the bed - no sticking until babystep=-0.12 at all

Looks like the calibration is still not consistent, although with S-1 it reports height deviations less than 0.07:
G32
G32 bed probe heights: 0.056 0.037 -0.068 -0.010 0.041 0.026 -0.060 -0.038 0.058 0.032 -0.059 -0.034 -0.000 0.021 0.029 -0.031, mean -0.000, deviation from mean 0.042

Thoughts:
either calibration is still incorrect or temperature is still incorrect.

Veti

can you check with 7 factor what the rod length is calculated to be.
and maybe try 8 factor.
https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer

SnakeSP

@veti Will do a bit later.
For now i've got some more interesting findings. Near the morning i've got crazy and ended up with Hotend at 235C and bed at 80C. And suddenly PLA sticked to bed even without any babystep. The print quality was bad, but plastic sticks. So it looks like more likely the problem is not with calibration itself, but with thermistors showing fake temperatures.
Hotend thermistor was set to B3950 (as on Biqu site where i've bought it).
Bed was B4267 as in Marlin.
I took a multimeter and tried to measure the temperature with it. For bed it was about 5С under on multimeter till 60C on Duet and about 8-9C under from 60С till 85C on Duet.
But with hotend this is a different story. I tried to put a thermocouple from multimeter to the heating cube near the thermistor shaft and the results on multimeter were absurdly low:
173C when it was 235C on Duet.
So the problem for now is: how to make printer thermistors show actual temperature (or at least close to real)?

Veti

@snakesp said in Having problems with Anycubic Kossel Linear Plus calibration:

Hotend thermistor was set to B3950 (as on Biqu site where i've bought it).

the chinese B3950 are a bit of a pain. that beta is only accurate for the range of 25-50C.
There seem to be different variation of these that behave differently at higher temperature ranges.
I had some trouble with those and in the end got a pt1000.

SnakeSP

@veti Don't have PT1000 right now, but looks like i'll end with it.
But i need to make prints by the end of this week and won't be able to get PT1000 by then.

As for the current thermistor, i've managed to get almost acceptable results up to 100C so far by using boiling water and measuring thermistor resistance (B3988). Now thinking how to get resistance at 200-250C. Possibly can steal curling iron from my wife and use it to get needed temperature

SnakeSP

@snakesp No luck, curling iron won't give steady temperature...
Yet looks like it is possible to print using temperature approximations with current beta: +5-10C on hotend and +7C on bed. Not best quality, but sufficient so far. Will get PT1000 or PT100 after a while.

Now back to calibration. The outcoming print does not have accurate dimensions. Z is less for 0,05, which is good enough.
But X and Y are off +0.3 - +0.4 mm. Which is not good. Changing rod length should resolve this i assume, but the question is: should i use autocalibration with S7 or just leave the calibrations as they are and only change the rod length in config-override.g?

Veti

@snakesp said in Having problems with Anycubic Kossel Linear Plus calibration:

PT1000 or PT100

PT100 will need a daughterboard.

should i use autocalibration with S7

i would do it once and see what the result is. you dont have to save it.

But X and Y are off +0.3 - +0.4 mm.

i have read that even though marlin uses 267 for rod length, some users say its 266.5

Danal

You said in your first post "no change to rods and carriages", and "changed the heating cube and nozzle". Do those changes affect Joint-to-Joint distance of the rods in any way? If not, stick to the length that worked for you in Marlin. With "worked" defined as "produced correct X & Y measurements".

-and-

Consider upgrading to Haydn Huntley magnetic-ball-end rods. They are the single biggest upgrade you can do to this printer; they will result in more noticeable quality than the change of controller board (I have one of these printers). And... Haydn's rods are marked for length. If you use his rods, always use that marked length.

Danal

Oh, and I'm running an E3D hotend in a Smart Effector. Running E3D's thermistor with no problems, and I regularly print anywhere from 190 to 240.

SnakeSP

@veti Yes, i know PT100 requres daughterboard, but it should be most accurate. I'm really tired of temperature sensors calibrations
PT1000 is cheaper, but i will need to change the heating cube at least because i haven't found PT1000 in 3 mm capsule, only in 4 mm.

Did calibration with S7:
6:14:15 PMM666
Endstop adjustments X-0.72 Y1.04 Z-0.32, tilt X-0.03% Y-0.20%
6:14:07 PMM665
Diagonals 274.863:274.863:274.863, delta radius 136.095, homed height 287.654, bed radius 115.0, X 0.469°, Y -0.907°, Z 0.000°
6:13:58 PMG32
Calibrated 7 factors using 16 points, deviation before 0.132 after 0.024
Don't think that 274.863 for rod will do any good, too big difference with reality.
Stayed at 266.5 for now. X is 100.32 mm (for 100 mm in model), Y is 100.97 mm. Will try M579 to compensate.