Faster Start gcode, and faster filament changes?

Bambu Lab H2 Series
1

The H2D takes WAY too long to start printing. I think it was taking 10-11 minutes before I messed with the gcode a bit, but then it was still taking 5-6 min. Even “switching filament” takes forever, which makes no sense, since I have one filament loaded in the left, and one in the right - there’s nothing to switch? Is there a way to disable all this junk and just force it to print, and keep printing? My non-bambu printers just start instantly once up to temp (and they’re slower to get up to temp, to be fair!). I’m sure a lot of these checks improve quality, but I don’t care about that when I’m in a hurry or trying to do quick prototypes, or especially trying to do many quick prints in a row.

However, I don’t want to delete gcode that’ll prevent it from leveling/calibrating if I do check those boxes. Any custom gcode people are using?

2

It’s intentional. Better heat soak. You want everything fast then you just manually modify the startup gcode, you can strip out quite a couple minutes.

Copy the start up gcode out to Visual Studio Code or other code editors and that would give you a easier to read and edit UI.

3

I even perform a heat soak using the following code in my machine setup: :wink:

M141 S[overall_chamber_temperature]

; ===== 15-minute heat soak start =====
M117 Heat soaking for 15 minutes...  ; Display message on screen
M400 S900                            ; Wait 15 minutes (900 seconds)
M117 Heat soak complete              ; Update display message
; ===== 15-minute heat soak end =====

M104 S{nozzle_temperature_initial_layer[initial_no_support_extruder]} A

I’ve included M141 and M104 just to show where I inserted my soaking code.

I need the extra 15 minutes to ensure the build plate is fully heat soaked.

Back to the topic though — you can probably reduce the startup time without sacrificing print quality by manually calibrating your filament and disabling auto-calibration in the settings. That should speed things up a bit.

Personally, I don’t feel like the filament switching is particularly slow. But out of curiosity, how are you defining “slow”? Just so I understand what it means in your case.

4

I cut a few minutes off my X1C startup by eliminating the spool read on the AMS units. I have four of them so that cut 16 spool reads on start up. I also don’t do bed leveling or calibration on every print. (Except maybe the first of a new filament.)