UM2 style homing

[napalm1432 0]

Hello,

I'm trying to build my own printer using a RAMbo board, everything works fine, but i want to do a ultimaker 2 style homing, meaning i want to use the lower endstop for the bed to home, and when the print starts letting the buildplate go up, i got the direction of the motor right, and it responds to the endstop on the bottom, but how do I get it to go up when the print starts?

I hope anyone can help me with this. if there really is no other solution i'll have to put the endstop on the top (which i really don't want).

Thanks in advance!

 

[tinkergnome 883]

...

i got the direction of the motor right, and it responds to the endstop on the bottom, but how do I get it to go up when the print starts?

...

 

I'm not sure if i completely understand your intention, but if you're talking about the software part...

In the Configuration.h of the Marlin firmware there are options for the direction of axes.

For the UM2 it looks like this:

 

#define INVERT_X_DIR true // 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 true // for Mendel set to false, for Orca set to true

#define INVERT_E0_DIR false // for direct drive extruder v9 set to true, for geared extruder set to false

#define INVERT_E1_DIR true // for direct drive extruder v9 set to true, for geared extruder set to false

#define INVERT_E2_DIR false // for direct drive extruder v9 set to true, for geared extruder set to false

// ENDSTOP SETTINGS:

// Sets direction of endstops when homing; 1=MAX, -1=MIN

#define X_HOME_DIR -1

#define Y_HOME_DIR 1

#define Z_HOME_DIR 1

So perhaps the "INVERT_Z_DIR" does the trick?