Geeetech

I'm new and I have some questions. Here is some information to let you know where I am at.

I have the latest Marlin firmware loaded, using GT2560 board. Motors work fine, no noise, nothing strange. Heaters all work ok, temp is good. There are limit switches installed on the min side of the x,y,z axis, but if I move the motors using Repetier in manual control and I push the limit switch in it doesn't stop the travel. I assume the configuration H is set up correctly, but I have some questions concerning that also.

Configuration H,

1. I have "#define MOTHERBOARD 7" but should it really be MOTHERBOARD 34 since I have 2 extruders and the heated bed? I don't see a description for #7.

2. I assume that the limit switches are not set up correctly since they don't stop the motor during manual control travel. So, I would need to edit configuration h but I'm not sure what to change. The switches are wired as NC and they do open when the switch is pushed in.

const bool X_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
const bool Y_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
const bool Z_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
const bool X_MAX_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
const bool Y_MAX_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
const bool Z_MAX_ENDSTOP_INVERTING = false;

I assume that I need to change the above endstops to TRUE for the XYZ min endstops, since I don't have MAX endstops can I leave them false?

3. Once I get the limit switches working I have a question. If operating the Y axis travel and it goes all the way to the limit switch then both the extruder heads are a little off the bed, with X axis limit activated the #1 extruder head will be off the bed, and #2 extruder will be off the bed at the max amount of travel, supposedly 200mm. How do I define the max travel so I don't go off the bed in Y and X axis?

Here?

#define X_MAX_POS 210
#define X_MIN_POS 0
#define Y_MAX_POS 210
#define Y_MIN_POS 0
#define Z_MAX_POS 180
#define Z_MIN_POS 0

4. For the Z travel, should the limit switch be set so that when the extruder is just touching the bed (1-2 piece of paper thick distance) then the switch is activated? And I assume that the bed would be leveled at this minimum distance between all 4 corners of the bed and the extruders.

I apologize for my long post, I really could use some help and although I am electrically, mechanically not a noob, this is really new to me...lol.

Thanks!

hi,JETNC.This seems to be a firmware issue.but i'm a little confused by your words:" but if I move the motors using Repetier in manual control and I push the limit switch in it doesn't stop the travel."did you do auto home in repetier host,and the axis couls not stop when hitting endstop?is that right?how about do auto home with LCD panel?

Thanks for your reply!

I fixed the issue with the limit switch, by mistake I connected them to X,Y,Z-Max, instead of Min. The limit switches work properly now.

Concerning the max travel. When the carriage moves to the X- Min position the left extruder #1 is off the bed, when I move to the X-Max position the right hand extruder #2 is off the bed. How do I adjust for this or is it ok?

JETNC wrote:Thanks for your reply!

I fixed the issue with the limit switch, by mistake I connected them to X,Y,Z-Max, instead of Min. The limit switches work properly now.

Concerning the max travel. When the carriage moves to the X- Min position the left extruder #1 is off the bed, when I move to the X-Max position the right hand extruder #2 is off the bed. How do I adjust for this or is it ok?

please try to adjust the endstop screw.you should make the screw hit endstop more ealier when extruder is off the bed.

I am working on the same issue. Just finished assembly of a Pro C and the right extruder is off the print bed when homing (extruder reaches front left bed)

I was told by a friend to utilize the offset to change the home to on the print bed. It appears to be roughly 7.8"x7.8"x7.8" for a safe build until I push it to its limit.

I believe I need to do some firmware editing but am unsure which settings need to be changed in the firmware. I can flash my bios easy and just need to have someone point me to the right line in configuration.h

I believe OP is on the right track to fixing the issue:

#define X_MAX_POS 210
#define X_MIN_POS 0
#define Y_MAX_POS 210
#define Y_MIN_POS 0
#define Z_MAX_POS 180
#define Z_MIN_POS 0

I believe these are the proper settings to adjust and that would be the min values. I recommend you try the following and I will tomorrow night when I can access my printer again:

#define X_MAX_POS 198
#define X_MIN_POS 8
#define Y_MAX_POS 198
#define Y_MIN_POS 8
#define Z_MAX_POS 180
#define Z_MIN_POS 8

Just guessing I believe this leave a small edge on the lip of the glass and keep the binder clips out of the way of the right extruder. My next goal will be figuring out how to set up the second extruder head. Will it need to be offset separately to ensure the minimum distance for it is different?

Once this is set-up right then it should be easy to get the 2nd extruder to follow suit.