Is this normal?

[BrentDW]

Hi folks.  Voron 2.4 printer.  Two things are happening that I'd like know if they are normal.  Both have to do with the gantry remaining level.  First, after I've homed, leveled the gantry, etc. if I move the print head around a bit, for printing or just messing around, the gantry isn't still "perfectly" level.  By this I mean if I run the gantry level macro its off by a hundredth of a mm or so.  it's enough where it needs to go around once to get it back within tollerance (.0075). I confirmed this making sure I didn't change the bed temp and my  gantry is not racked.  Is this normal?  Secondly, after I turn the printer off, the gantry sags ~2mm.  Thus, each time I turn it back on I have to relevel the gantry.  It's good hygiene anyway, but wanted to know if this is normal. 

Thanks in advance for your time, insight and consideration.

Brent

[SuperBoppy]

The gantry leveling procedure will run every time you start a new print job. At least, it should. Make sure the gantry leveling procedure is called out in your startup file. Yes, the gantry can sag and go out of level when the stepper motors no longer lock it in place when the machine is turned off. 

[TitusADuxass]

Mine always does 2 "laps" when I QGL it.

But, mine does not sag when I turn it off (which I hardly ever do). It shouldn't sag on power-off, the belt gearing is suppose to prevent sag. Check the Z belt tension.

[NikosSprocket]

Have you tightened lately all the bolts?

After my two Voron 2.4 builds, I found out after a few prints, heat cycling etc. they needed little tightening; especially after a brand new built. Then after a while they do not need any more.

[Penatr8tor]

Yep fully normal.

My Z axis sags enough that it needs to be recalibrated on every print.

Yet another reason why, IMO, the Trident is a better design than the 2.4.

[claudermilk]

Remember: these are glorified, computer-controlled hot glue guns. Off by a hundredth of a millimeter is fine. The gooey plastic will compensate.

[JacquesM]

My gantry slightly drop when I turn the printer off, of course more if I move the print-head manually. 
In order to reduce this effect I park the print-head on pillars (below  the bed) before switching off.

GantrySupport v10.f3d GantrySupport - Arrière v3.stl GantrySupport - Avant_L.v3.stl GantrySupport - Avant_R.v3.stl

Edited Friday at 09:28 AM by JacquesM

[NikosSprocket]

On 6/12/2025 at 8:02 AM, Penatr8tor said:

Yep fully normal.

My Z axis sags enough that it needs to be recalibrated on every print.

Yet another reason why, IMO, the Trident is a better design than the 2.4.

Same with both of my 2.4r2 Voron; 350 and 300 mm. The drop after power-off is almost invisible, but it definitely needs a QGL the next power-up. As mentioned before, the Startup script always runs a QGL and a Z calibration (not offset) before each print as the cabinet and the bed have warmed-up.