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A3S V1 Air Prints from Z at Which Temperature is Set, Unless G28 (Home Extruder) is Added Manually

poikilospoikilos Posts: 7Member
I was solving this with "baby-" but now have an automatic workaround. The nozzle doesn't go back down to the bed after raising the nozzle to wait for temperatures to be reached. I must set home after that by manually editing the gcode. That is the only way it will work (see below). If I enable mesh leveling after that, it fails too (commented in code below). Why does this happen? 
The first part of the code (with the workaround) is below.

generated by Slic3r 1.3.1-dev (Build 2ef957d) on 2019-11-06 at 12:56:22

; external perimeters extrusion width = 0.44mm (2.08mm^3/s)
; perimeters extrusion width = 0.46mm (4.40mm^3/s)
; infill extrusion width = 0.46mm (4.40mm^3/s)
; solid infill extrusion width = 0.46mm (1.26mm^3/s)
; top infill extrusion width = 0.46mm (0.88mm^3/s)

G92 E0
M190 S90 ; set bed temperature and wait for it to be reached
M104 S220 ; set temperature
; default Slic3r code
G28 ; home all axes
G1 Z5 F5000 ; lift nozzle
; M420 S1 ; enable mesh bed leveling (Pinches, 2018)

; A5 (not A5S) mesh bed leveling applies to A3S V1 (Pinches, 2019)

; Martin H. Jan 27, 2019 https://forum.repetier.com/discussion/6139/gcode-purge-line-before-print
; Pinches, S. (2018, February 4). Mesh bed levelling. Retrieved November 6, 2019, from The Unofficial JGAurora Wiki website: https://jgaurorawiki.com/a5/mesh-bed-levelling-routine
; Pinches, S. (2019, November 5). How to use mesh bed leveling on custom firmware [Reply]. Retrieved November 6, 2019, from The Unofficial JGAurora 3D Printer Forum website: https://jgauroraforum.com/discussion/896/how-to-use-mesh-bed-leveling-on-custom-firmware
; Filament gcode

M109 S220 ; set temperature and wait for it to be reached
G28 ; Home extruder ; not adding this after temp is reached causes air printing
; M420 S1 ; enable mesh bed leveling (Pinches, 2018) ; causes air printing
G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G92 E0
G1 Z0.360 F7800.000
G1 E-6.50000 F1500.00000
G92 E0
G1 X67.187 Y80.174 F7800.000
The "code" and "pre" tags show up fine if I click preview on the post, but not when I click on the article. I tried "code spoiler" but then the preview actually removed the code when I click preview (only showing links), and ignores newlines. I'm using "pre" inside of a spoiler for now. Here's a Pastebin link in case it still doesn't display correctly: https://pastebin.com/KEygJuwe
Thanked by 1Samuel Pinches
Post edited by poikilos on


  • poikilospoikilos Posts: 7Member
    edited November 8
    This problem is apparently solved! I used the recommended start (with wipe) gcode (and end gcode--unrelated) from here: https://jgaurorawiki.com/start-and-end-gcode

    I will post more information after I try re-adding the  M420 S1 ; enable mesh bed leveling (Pinches, 2018) line (from https://jgaurorawiki.com/a5/mesh-bed-levelling-routine) after the existing G28 (home all axes).
    Thanked by 1Samuel Pinches
    Post edited by poikilos on
  • Samuel PinchesSamuel Pinches Posts: 2,144Administrator
    No idea what's going on with pre and code tags... vanilla forum is in active development, and small things tend to break and be fixed from version to version. Thanks for pointing it out, I'll have to keep that in mind to check out one day. pastebin is a good solution in the meantime, otherwise I typically fix posts manually as I see them.
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