"Absorbing Heat" on screen
So i've just finally finished a Core One build.
Among a bunch of issues - pressed print and on the screen in the mid upper left came the words "Absorbing Heat" and a number% that increased very very slowly and nothing happened till it got to 100% about 20 minutes later then it started a nozzle clean and failed. The repeat clean worked and its doing my first print now.
What is that "Absorbing Heat" about?
What heat, where?
RE: "Absorbing Heat" on screen
And again. Second print. now waiting 15 minutes while "absorbing Heat" just passes 60%
This rubbish. I cannot afford to wait 20 minutes before each print.
How do I stop this issue?
RE:
And again. Second print. now waiting 15 minutes while "absorbing Heat" just passes 60%
This rubbish. I cannot afford to wait 20 minutes before each print.
How do I stop this issue?
It actually serves a purpose. However, it's confusingly named. What it's doing is waiting enough time for the print bed to reach thermal equilibrium and thermal expansion before probing starts. Not doing this could result in thermal expansion happening during the print and causing issues like the print popping off the plate because the z-mesh (from the probing) is no longer accurate.
That said, for low temp filaments like TPU, PLA and PETG that are also not prone to warping, I personally don't think it's needed and so I turn it off. To do this you select "Expert mode" in PrusaSlicer, go to the Printers -> Custom G-code -> Start G-code section. Look for G29 G ; absorb heat and change it to the following and save your modification into the user presets. Also for sheets like the BIQU Cryo, even for engineering filaments, it's debatable whether this is really needed.
{if filament_type[initial_tool] !~ /.*(FLEX|PLA|PETG).*/}
G29 G ; absorb heat
{endif}
RE: "Absorbing Heat" on screen
Want to also add that not doing this for large prints could possibly result in the head colliding with the print and a subsequent layer shift. For small prints, I don't think it matters.
RE: "Absorbing Heat" on screen
Mmm.
this is a major issue then.
I do almost all my work in ABS and there is no way that if I have to keep this on is this is acceptable.
This is my 4 th Prusa ( have one each of Mini, mK3s and Mk4 and none of them do this to this step and don’t have issues as described because they don’t do it.
If this is a function of this model and I can’t get rid of this issue I will be returning the printer. It’s making it unusable in my little farm because I can’t be waiting 20 minutes on top the usual nozzle and bed heat time.
I did my due diligence before I bought this printer and never found any mention of it. I think Prusa need to tell people that there’s a nearly 30 minutes “start” time before each print.
RE:
Comment out this line and it will stop doing it. Will that cause problems with your ABS prints? Don't know but you can experiment and see. I suppose making this a firmware option instead may be easier for some. You can create a Feature Request here: https://github.com/prusa3d/Prusa-Firmware-Buddy/issues
G29 G ; absorb heat
RE: "Absorbing Heat" on screen
There is indeed an enhancement request going back to the XL here: https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/3534