Ender 3 pro blue screen fix July 8, 2019 16 32 64 128 Ender 3 blue screen fix How to fix ender 3 pro blue screen of death Ender 3 screen glitch Ender 3 s1 pro clogged Ender 3 bltouch setup Ender 3 bltouch marlin configuration Ender 3 not printing correctly