Hictop 3DP-17 z-rod top spacer for auto levelling z by g-code

thingiverse

Very simple spacers, also serving as a handy quick test print, are placed over the z rods so that you can auto-level the z plane by raising the z-axis to the top and 'bumping' into the top. Be extremely cautious to ensure that your z-axis will travel all the way to the top without colliding with anything. The result of going slightly beyond the printer's z maximum causes the steppers to skip, but it leaves the z plane as level as the top of your printer. So also check that the top of your printer is level or square compared to the rest (you can compare a spirit level at both the top and bottom). I then added the following g-code to my slicer which homes in, bumps z, and then homes again - this is very crucial after bumping z - and does G29 bed levelling. It also heats the bed and nozzle simultaneously. The nozzle is heated as far as possible without creating ooze during G29. Finally, it heats the nozzle to 180 degrees Celsius and performs a good extrude and wipe at the front of the bed before starting to print. CHECK AND UNDERSTAND BEFORE USING - YOU MUST UPDATE TO THE LIMITS OF YOUR PRINTER!!! https://drive.google.com/file/d/0B_5CzAtDHu6pMkNQWnAzeW16WkU/view?usp=sharing USE AT YOUR OWN RISK!!!