Raise or Lower Z height for different filaments?
I've been printing with PLA for a while and have everything dialed in perfectly. The prints always come out perfect.
I'd like to start printing with PETG. First test prints did not go too well, and I think a likely culprit is that the nozzle is too close to the bed when starting.
Is it possible to save a setting somewhere for the PETG filament profile that raises the Z a little bit, but then when switching back to a PLA profile it returns the nozzle to the first height?
RE: Raise or Lower Z height for different filaments?
With later firmwares (3.8.1 and later iirc) you can store separate live z values for multiple spring steel sheets. You do need to run through calibration for each 'sheet' first but you could just calibrate the same sheet twice, once with pla dn the second with petg.
Personally I run Jeff's Life Z method with pla and petg and note the different z values. Once you know the offset its easy just to back the value off when printing petg.
RE: Raise or Lower Z height for different filaments?
With later firmwares (3.8.1 and later iirc) you can store separate live z values for multiple spring steel sheets. You do need to run through calibration for each 'sheet' first but you could just calibrate the same sheet twice, once with pla dn the second with petg.
Personally I run Jeff's Life Z method with pla and petg and note the different z values. Once you know the offset its easy just to back the value off when printing petg.
The problem is remember to change the Z height when changing filaments. The good news is that after raising the nozzle height by a small amount my test PETG prints are coming out good. But I can totally see myself not remembering to change the height without some sort of reminder before the print starts, or as I asked saving the Z height in the filament somewhere.
RE: Raise or Lower Z height for different filaments?
The problem is remember to change the Z height when changing filaments. The good news is that after raising the nozzle height by a small amount my test PETG prints are coming out good. But I can totally see myself not remembering to change the height without some sort of reminder before the print starts, or as I asked saving the Z height in the filament somewhere.
Early on in my 3D printing experience, I spent a lot of time worrying about this. Someone at the time had a suggestion to enter custom startup gcode for PETG filaments that would adjust the 0 position up by a bit (0.02-0.2mm) in PETG profiles. In reality, experience has convinced me it's not really worth worrying about it too much. Once I've refined my filament profile -- primarily calibrating the extrusion multiplier -- I only raise (make less negative) Live-Z by something like 0.02mm when switching to PETG. If I forget, the 1st layer can be a bit more rough, but that's about it. The underside tends to be fine, and any roughness is buried within the print.
and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan
RE: Raise or Lower Z height for different filaments?
Early on in my 3D printing experience, I spent a lot of time worrying about this. Someone at the time had a suggestion to enter custom startup gcode for PETG filaments that would adjust the 0 position up by a bit (0.02-0.2mm) in PETG profiles. In reality, experience has convinced me it's not really worth worrying about it too much. Once I've refined my filament profile -- primarily calibrating the extrusion multiplier -- I only raise (make less negative) Live-Z by something like 0.02mm when switching to PETG. If I forget, the 1st layer can be a bit more rough, but that's about it. The underside tends to be fine, and any roughness is buried within the print.
Can you please say more about how to calibrate the extrusion multiplier?
RE: Raise or Lower Z height for different filaments?
Can you please say more about how to calibrate the extrusion multiplier?
I've got a lot of notes here. Prusa has a https://help.prusa3d.com/en/article/extrusion-multiplier-calibration_225 7" target="true">different approach here.
and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan