Z-rod maintenance

Moves Z repeated up and down and makes it possible to look for points where the z-rods sticking / binding. At the same time, you can clean and lubricate the z-rods in motion

img.wp-smiley,img.emoji{display:inline !important;border:none !important;box-shadow:none !important;height:1em !important;width:1em !important;margin:0 .07em !important;vertical-align:-.1em !important;background:none !important;padding:0 !important;}.logo{width:61px;}