Situation... When I attempt to home my printer it deploys the probe and retracts

3D Printing
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1

Situation…

When I attempt to home my printer it deploys the probe and retracts on the first touch but then the z axis doesn’t raise and continues to drive the head into the build plate. I am using the latest Marlin RC Bug Fix and my hardware is as follows:
MKS GEN V1.4
DRV_8825 Steppers
T2 timing belt with 16 tooth pulley
T8 Lead Screw Dia 8MM Pitch 2mm Lead 8mm
BLTouch

I have my DEFALT_AXIS_STEPS_PER_UNIT @(200, 200, 800, Extruder)

Where am I going wrong? It was working just fine.

2

1 of 2 things - firmware issue or bad probe signal connection.

3

Here is a video to illustrate the issue I’m having.
missing/deleted image from Google+

4

Here is a copy of my Config.h file.

5

Read the config notes about the BL Touch This is most likely your issue -
/**

  • BLTouch WARNING - ONLY APPLIES TO VERSIONS OF MARLIN BEFORE 15 FEB 2017
  • Unless using interrupt endstops, there is a MINIMUM feedrate for Marlin to reliably
  • sense the BLTouch. If the feedrate is too slow then G28 & G29 can sometimes result
  • in the print head being driven into the bed until manual intervention.
  • The minimum feedrate calculation is:
  • feedrate minimum =  24000 / DEFAULT_AXIS_STEPS_PER_UNIT

  •    where feedrate is in "mm/minute" or "inches/minute" depending on the units used

  •    in DEFAULT_AXIS_STEPS_PER_UNIT
  • This applies to the HOMING_FEEDRATE_Z and Z_PROBE_SPEED_FAST. If PROBE_DOUBLE_TOUCH
  • is enabled then it also applies to Z_PROBE_SPEED_SLOW.
    */