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--- a5:modifications:bltouch [2018/11/13 02:03] – red_m
+++ a5:modifications:bltouch [2020/03/29 20:24] – tito-alo
@@ Line 4: / Line 4: @@
 The metal pin BLTouches are fine as far as I know but the newer plastic ones may also have this issue.
-This will only work on the 1.1.9 Marlin firmware for the JG A5, which is in beta and may have extra bugs.
+This guide will only work on the 1.1.9 Marlin firmware for the JG A5, which is in beta and may have extra bugs.
 A 1.1.8 version may come out if someone else is willing to do one on the wiki however I don't use 1.1.8
@@ Line 46: / Line 46: @@
 ----
+===== Compatibility with Babystepping ====
+I would strongly advise you to activate Babystepping, it allow to finely tweak your first layer while this one is printing, directly from the LCD screen.
+In Configuration_adv.h, uncomment the line <code>#define BABYSTEPPING</code>
+In addition to the modification in the firmware, you need to have a [[a5:lcd-firmware|custom LCD firmware]], see here for more info about babystepping: [[a5:babystepping|Babystepping]]
+===== Fine settings the bl touch height ====
+When printing with octoprint for example, babystepping is not available for fine tuning.
+I follow the following procedure to precisely set the distance between the nozzle and the printer bed, after updating or to take a new mesh/repeat the automatic bed levelling:
+<code>
+G28        ; home
+G29 P1     ; start the automatic bed leveling
+           ; wait for bed leveling to finish (should take about 5 minutes)
+G29 S1     ; save the mesh information into slot 1
+G29 S0     ; save in slot 0 as well as Cura use slot 0 per default
+M500       ; save EEPROM
+M851       ; print the current setting
+M851 Z0    ; set offset to zero
+G28        ; home again
+G1 Z0      ; move the nozzle to height 0
+           ; measure the distance between the nozzle and the bed with some feeler gauge
+           ; or stack several piece of paper and measure the thickness
+M851 Z-1.6 ; enter the measure distance, in this example, the head is 1.6mm above the printer bed
+M500       ; store the new configuration
+G28        ; home again
+G1 Z0      ; move the nozzle to height 0 - Then mesure again, if it's not right yet, restart at step M851 Z-1.6 (increase the value to bring the head closer to the bed)
+</code>
+Keep adjusting
+If you need to change the height, simply do:
+<code>
+G28        ; home
+M851       ; display current setting
+M851 Z0    ; set offset to zero
+G28        ; home
+G1 Z0      ; move the nozzle to height 0
+M851 Z-1.7 ; the new value
+           ; increase if the first layer is too sick, 1.7 for example
+           ; decrease if the first layer is too thin/the nozzle scratch or hit the bed, 1.5 for example
+M500       ; store the new configuration
+</code>
 ===== My own BLTouch enabled Configuration.h =====

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