Problems setting up Delta G2S (auto-leveling)

[rxn123talon]

Greetings,
I have just finished assembling a Delta Rostock mini G2S and have come across a few issues. I am using the latest version of the firmware and have had the following issues (with solutions) but am stuck on the last issue.

1) the printer was homing in the wrong direction (driving the heads towards the hot bed). This was fixed by modifying the configuration.h to the following
#define INVERT_X_DIR false // for Mendel set to false, for Orca set to true
#define INVERT_Y_DIR false // for Mendel set to true, for Orca set to false
#define INVERT_Z_DIR false // for Mendel set to false, for Orca set to true

This was against the directions, but was a solution found here on the forum and works.

2) The logic for the z min probe was incorrect. This was again found on the forum and works.
const bool Z_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop.

3) Here's where I'm stuck. I have followed the directions and read them again... I can home the printer fine. I have the z max height properly configured, the z min probe set... however, when run G28 to auto level after G29, it runs through a bunch of points (shown in log clip below) before it starts to mash against the bed requiring a power off. PLEASE ASSSIT! I would love to be able to try to print something.

20:44:15.730 : echo:enqueing "G28"
20:46:28.300 : Bed x: 49.80 y: -49.80 z: 2.70
20:46:30.934 : Bed x: 16.60 y: -49.80 z: 2.59
20:46:33.594 : Bed x: -16.60 y: -49.80 z: 2.45
20:46:36.371 : Bed x: -49.80 y: -49.80 z: 2.22
20:46:39.183 : Bed x: -49.80 y: -16.60 z: 1.74
20:46:41.828 : Bed x: -16.60 y: -16.60 z: 2.20
20:46:44.424 : Bed x: 16.60 y: -16.60 z: 2.47
20:46:47.049 : Bed x: 49.80 y: -16.60 z: 2.47
20:46:49.714 : Bed x: 49.80 y: 16.60 z: 2.30
20:46:52.405 : Bed x: 16.60 y: 16.60 z: 2.14
20:46:55.148 : Bed x: -16.60 y: 16.60 z: 1.84
20:46:58.111 : Bed x: -49.80 y: 16.60 z: 0.97

[Sherry]

view these coordinates,it seems that the auto-level is not successful.and maybe the hotbed is a little inclined.so please adjust the hot bed plane.
then,you need to define z final axis height.those coordinate shows that the around point is higher than center.so you'd better adjust z axis height.
more information please refer to the link: http://www.geeetech.com/wiki/index.php/ ... xis_height

[smithti8]

I am having the same problem. How do you "so please adjust the hot bed plane"? Do you adjust this by adding washers or something under the end-stop screw.

[Mark]

How about adjust the 3 screws to make the points around the bed in a same plane.

[myxlflik]

I actually assembled my endstops in a completely different manner than the picture shows. I put the spring on the screw head side of the carriage and just the nut on the top side. This has enabled me to actually make adjustments to the end stops sho they are properly set. I then set the following scripts:

Script 1:
G28
G0 X0 Y50 Z2 F8000

Script 2:
G28
G0 X43.3 Y-25 Z2 F8000

Script 3:
G28
G0 X-43.3 Y-25 Z2 F8000

Script 4:
G28
G0 X0 Y0 Z2 F8000

If your bed is now bowed or cupped and you do these scripts repeatedly, you can adjust the the end stop screw of the leg closest to the head for Scripts 1, 2 and 3. Repeat until the head comes down to a point that a piece of paper grabs the hotends. Once you have that set, your end stops should be perfect. I am still trying to figure out how to do the auto-levelling setup though. G29 just thrashes around and crashes the hotends ultimately. Lots of collisions. I would definitely like some tips on this if anyone knows how to work through it.

[Mark]

How about the endstop status before G29? Is the home function worsks well?

[smithti8]

I have the same problem. I thought I had the bed plane adjusted well, but the auto-leveling collided with the bed and broke the arms off. I even had set the z-axis height where the 0 position was about 1/2mm above the bed. I had adjusted the 3 reference points and they were all within 1 index card width of each other. I had check the endstop status and the auto-leveling limit switch appeared to be working fine. It made through 8 or 9 probe points before it broke. I will repair the broken printed part and try again, but any suggestion would be helpful. What is the tolerance of the 3 reference points (0.1mm, 0.5mm?)

[Mark]

As the problem we all experience, I suggest not to worry about it and just skip it , the printer can also work well without it . And later we'll try to find a solution to this.

[myxlflik]

I originally had the problem of G29 thrashing around and crashing horribly. This was the result of the z min endstop logic. The default with the probe down is close instead of open. If you change the Z_MIN_ENDSTOP_INVERTING value to true in configuration.h and re-compile, I believe your problems with G29 will go away.

[myxlflik]

How about the endstop status before G29? Is the home function worsks well?

Yes, the G28 home function works perfectly well on my printer. Right now, the only problem I am having is with my extruders/hotends, but that's another topic so I won't contaminate this one.