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Submitted by Simon Wilmann on Sat, 04/11/2020 Permalink

Hi Dan


First i want to say this is awesome and Im really grateful for your work.

So I have this weird issue.

When doing a G28 homing the Z the first time the bltouch activates but it seems to ignore it for the first activation but after the second activation it works like it should. but not after the hotend hits the bed.

It will do a second check and not hit the bed. and then go about its way and print just fine.


if i do a g28 it does the 25 point bed test no issues does not hit the bed.

my current start code is this.(Hitting the bed happens any time I run G28)

M140 S55
M190 S55
M104 S200
M109 S200
M82 ;absolute extrusion mode
M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration
M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate
M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration
M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk
M220 S100 ;Reset Feedrate
M221 S100 ;Reset Flowrate

G28 ;Home
M420 S1
G92 E0 ;Reset Extruder
G1 Z2.0 F3000 ;Move Z Axis up

not sure what im doing wrong. I hope i explained it well enough. tried looking around the web but cant find anyone with this issue.


also note i have moved the touch to PIN 29.

changed it in config.h and in "pins_MELZI_Creality.h"




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