Ender 3 v3 max volumetric speed July 8, 2019 16 32 64 128 Ender 3 v3 se max volumetric speed Ender 3 v3 ke max volumetric speed Ender 3 pro speed upgrade Ender 3 s1 max print speed Ender 3 s1 printing speed Ender 3 v2 temperature calibration