Z lift after homing and not returning

Hi...

I have a Flsin plus i3 which is about to go flying out a window...

Couldn't get auto Level to work so I thought id go back to a micro switch, simple... no.

Every time I home the Z-axis it lifts up, which is fine, but then when it goes to print it will not drop to the right height so i end up printing 2mm in the air. when homing the nozzle is the correct height when the switch is activated so its not that part.
i went into the Marlin code and turned off all i could find that lifts the Z after homing, just to see and still no luck.
Then i thought it was my slicer, Simplify 3d but none of the gcode there says to do a lift. (bear in mind i run 2 ultimakers and another kit printer too)

Ive just about had it with this thing. Can anyone lend a hand?

most common issue is #define DEFAULT_MAX_FEEDRATE { 500, 400, 5, 25 }
change it to #define DEFAULT_MAX_FEEDRATE { 500, 400, 3, 25 }
Check it updated with a m503, and if needed use m502 to load configuration.h values then m500 to save to eeprom

Edited 1 time(s). Last edit at 10/14/2019 09:38AM by Dust.

Quote
Dust
most common issue is #define DEFAULT_MAX_FEEDRATE { 500, 400, 5, 25 }

This value applies only to the feed rate. Not related to nozzle height or Z axis!

Dig towards Offset_Z.

I will elaborate for the new person...

/**
 * Default Max Feed Rate (mm/s)
 * Override with M203
 *                                      X, Y, Z, E0 [, E1[, E2[, E3[, E4]]]]
 */
#define DEFAULT_MAX_FEEDRATE          { 300, 300, 5, 25 }

Ie the 3rd number is max feed rate for the Z axis.
Many have this value set to high and Z stalls out, Often when moving up.

Edited 1 time(s). Last edit at 10/15/2019 06:18AM by Dust.