Klipper ender 3 4.2.7 bltouch July 8, 2019 16 32 64 128 Klipper ender 3 4.2 7 bltouch config Bltouch ender 3 klipper Klipper for ender 3 s1 Ender 3 bltouch marlin configuration Ender 3 bltouch setup