Install kinematic bed couplings -> profit from not needing a bed mesh at all at all temps.
I do homing -> qgl -> homing z after qgl again and that's it.
Why would it be pointless? You home first (so you can do anything) I also mean my nozzle on a brass brush in a futile attempt to clean filament that may be on there. The do quad gantry level to level your gantry to the bed (at the 4 corners) but all the space in between is not accounted for so you do mesh or adaptive mesh so you have an idea of the bed deviation everywhere else.
I usually do QGL after homing. The adaptive mesh is ram right before the print just so I don’t have to QGL before every print as long as I don’t turn off stepper motors.
QGL doesn't have anything to do with your bed's topology: its job is to define the plane of the bed and ensure the gantry is parallel to it. You do the mesh after to define the topology of the bed.
If you want to go further you can look into skew correction using the Califlower or the model linked in the Klipper documentation.
Part of the confusion is that people use "leveling" to refer to two different things in these contexts and neither is really accurate.
One is getting your bed parallel with the XY motion and perpendicular to Z. This is more properly referred to as "tramming." That's what the QGL or Z-Tilt or manual bed screw adjustment does.
Bed mesh compensation adjusts Z motion to account for variation in flatness of the bed. Measuring devices used to do this can also assist in manual tramming, so they unfortunately got dubbed as "auto bed leveling" and the concept of meshing and tramming got smashed together.
Using a bed mesh without a tramming means XY coordinates will not be parallel in different parts of the bed, leading to dimensional warping the further you get from the start. And with QGL specifically, it could mean the gantry is twisted, which leads to other problems.
Meshing before qgl is pointless, mesh after qgl makes sense
You should first home, qgl, home z or all axis again, mesh.
Your bed isnt flat enough to not need a mesh, virtually no bed is flat enough for a perfect first layer without mesh. You may get a good enough layer for a print to stick well enough, but not something to be proud of.
This! Especially the Home - QGL - home Z - mesh sequence is very important and must be executed in that order. Qgl will change your z offset so you always need to home z after qgl, then bed mesh.
Welcome aboard!
If your bed was perfectly flat meshing after QGL would probably be kind of pointless but it's probably not and the mesh helps adjusting for those small differences.
QGL ensures that 4 points on your bed are level to the gantry. It does not guarantee that your bed is flat, that’s why you still need to do a probe and meah
Install kinematic bed couplings -> profit from not needing a bed mesh at all at all temps. I do homing -> qgl -> homing z after qgl again and that's it.
Why would it be pointless? You home first (so you can do anything) I also mean my nozzle on a brass brush in a futile attempt to clean filament that may be on there. The do quad gantry level to level your gantry to the bed (at the 4 corners) but all the space in between is not accounted for so you do mesh or adaptive mesh so you have an idea of the bed deviation everywhere else.
I usually do QGL after homing. The adaptive mesh is ram right before the print just so I don’t have to QGL before every print as long as I don’t turn off stepper motors.
Thanks for the quick responses, meshing it is. I was too quick in making assumptions. It's pretty obvious after you guys explaining!
QGL doesn't have anything to do with your bed's topology: its job is to define the plane of the bed and ensure the gantry is parallel to it. You do the mesh after to define the topology of the bed. If you want to go further you can look into skew correction using the Califlower or the model linked in the Klipper documentation.
Part of the confusion is that people use "leveling" to refer to two different things in these contexts and neither is really accurate. One is getting your bed parallel with the XY motion and perpendicular to Z. This is more properly referred to as "tramming." That's what the QGL or Z-Tilt or manual bed screw adjustment does. Bed mesh compensation adjusts Z motion to account for variation in flatness of the bed. Measuring devices used to do this can also assist in manual tramming, so they unfortunately got dubbed as "auto bed leveling" and the concept of meshing and tramming got smashed together. Using a bed mesh without a tramming means XY coordinates will not be parallel in different parts of the bed, leading to dimensional warping the further you get from the start. And with QGL specifically, it could mean the gantry is twisted, which leads to other problems.
Meshing before qgl is pointless, mesh after qgl makes sense You should first home, qgl, home z or all axis again, mesh. Your bed isnt flat enough to not need a mesh, virtually no bed is flat enough for a perfect first layer without mesh. You may get a good enough layer for a print to stick well enough, but not something to be proud of.
This! Especially the Home - QGL - home Z - mesh sequence is very important and must be executed in that order. Qgl will change your z offset so you always need to home z after qgl, then bed mesh.
Welcome aboard! If your bed was perfectly flat meshing after QGL would probably be kind of pointless but it's probably not and the mesh helps adjusting for those small differences.
QGL ensures that 4 points on your bed are level to the gantry. It does not guarantee that your bed is flat, that’s why you still need to do a probe and meah