Marlin 1.1.8 with BLTouch for i3 Pro B - with T8 Lead Screw

[andyparla]

One question, what is the pin 11? I have a lot problem with bltouch

[andyparla]

The problem is this version compile with latest arduino IDE version. It does not compile with the recomended 1.0.1 version by Geeetech.

[William]

The pin of 11 is for Bltouch signal

[JohnDeere630]

I'm using a BL-Touch on my I3 with Marlin 1.1.8, and the GT2560 board with no problems.

Do you have the BL's 3-wire connector attached to the Z-Max socket?

Did you replace the 2-pin socket with the 3-pin that is needed?
Pin 11 is the Z-Max signal pin, IIRC. Did you enable BL-Touch in the firmware?
I certainly don't mean to patronize, but your post didn't give much information....

Edit...I just noticed that I have the older GT2560 board without the 3-pin BL-Touch terminal up by where the thermistors plug in, so my BL-Touch's 3-pin terminal is connected to the Z-max socket, which uses pin 32 as the signal pin. Pin 11 is the dedicated BL-Touch signal pin. William is right. Sorry!

[andyparla]

Hi,
the problem i have with this firmware is nozzle is so far from bed. And I send the command from repetier "M851 Z-1.5 ; to set the offset you got in the previous step." and it does not do anything I have tried with "M851 Z-20" and "M851 Z20" But nozzle is about 4 mm from bed. I does not take down with command. i dont understand it.

Thanks for your reply

[JohnDeere630]

andyparla,
There is a setting in config.h that allows negative z movements, but where it is depends on the firmware version. On Marlin 1.1.8, it is this, in the z-probe section, starting at line 803:

// Min software endstops curtail movement below minimum coordinate bounds
#define MIN_SOFTWARE_ENDSTOPS
#if ENABLED(MIN_SOFTWARE_ENDSTOPS)
#define MIN_SOFTWARE_ENDSTOP_X
#define MIN_SOFTWARE_ENDSTOP_Y
//#define MIN_SOFTWARE_ENDSTOP_Z
#endif

Note that the #define MIN_SOFTWARE_ENDSTOP_Z is commented out. If it is not, it won't allow negative Z movements. Hope this helps!

[andyparla]

Yes I read it. but nozzle does the same it does not move near bed. It is always about 2mm from bed. I have tried everything I read.

I've Enabled Eeprom
I've Enabled eutoleveling
I've changed offset min and max to -20 and 20
I've calibrated the autolevel screw
And
I've change the parameter MIN_SOFTWARE_ENDSTOP_Z to false in firmware by default but I've tried with 1.1.8 new marlin version as you said.

Then I send the next command:
M851 ; It returs -1.29
M851 Z0 ; set the offset to zero
G28
G1 Z0

At last command the nozzle is about 2 mm.

I use the next comand
M851 Z-3.9 ; to set the offset near to bed (it nozze is about 2mm from bed and offset is -1.29 I calculate about -3.9 more or less)

But when I send G28 AutoHome comand, the nozzle continues at same position. So I dont know what happens.

[JohnDeere630]

[quote=andyparla ]
I've change the parameter MIN_SOFTWARE_ENDSTOP_Z to false in firmware by default but I've tried with 1.1.8 new marlin version as you said.
[/quote]

andy, did you comment the line, or did you add the word false to the end of it? Can you post the relevant section of your config.h file? To work, the line must be commented out by adding a double slash to the beginning. Adding the word false to the end of the line won't work.

PS, I don't know why the BBCode doesn't work for me on this forum; it's enabled in my profile...

[andyparla]

Hi!

hahaha no problem.

I commented the line on marlin 1.1.8 But in by default firmware I cannot comment the line so I tried set a false value. Both with same result, Nozzle does not down

[JohnDeere630]

andy, one more foolish question...are you using a computer or the LCD on the printer? I seem to recall I couldn't move the nozzle below 0 in Repetier, but could move it using the move axis menu on the LCD. If you are using the LCD, I am flummoxed. If I could see your config.h file, I might spot the problem. I have spent a fair amount of time wading around in mine, LOL.