A quick video showing Smoothieware grid leveling in action. My nozzle is used as a z probe and makes contact with the Mic-6 bed to complete the z probe circuit. I have been very happy with the results.
https://youtu.be/IqsLeKRI_Z4
I like the minimalistic solution. But if there will be loose material (hard with cold nozzle or even hot at nozzle tip) and the contact not happens… I know the silicone sock helps here, but is it 100% reliable solution? Isn’t there dents at measuring spots after weeks? (I use different probes on my printers, from inductive to pressure.)
As with any method setup preparations must be taken. The nozzle is heated to 180c and cleaned with steel wool before the leveling process. The nozzle is then cooled to room temperature and the bed is cleaned and heated to 60c. This process ensures that conductive contact will be made. The bed is not levelled before every print. It is only levelled periodically. I also use this method to find z zero.
Do you home every time or save the points? I will be trying this on my new delta.
@Kyle1 Ah, OK. I thought (wrong) it’s about autolevelling before every print. 
I like it, on my next diy I hope to incorporate something similar, however I’ll need to tweak it a little as I use glass and/or PEI
I print straight to the MIC-6 with a layer of hairspray. So far I haven’t had anything NOT stick to the bed. PLA sticks almost too well.
@Griffin_Paquette The Z grid leveling data is saved after the grid leveling process is complete. The M code M374 will save the grid to the Smoothieboard’s SD card. An M375 before every print will load the grid file.
To fine tune my Z home the printer will home towards its max travel (home limit switch location) I then send it a G30 and the bed will raise until it touches the nozzle (Z MIN). Smoothie will then report back the distance traveled from home (Z Max) to Z min (the nozzle aka Z0). I then update the config with the value reported. Now everytime I home the Z axis to Z max (Z home limit switch) Smoothie knows that it is XXXmm to the nozzle aka Z min. Basically when you home the Z axis to max Smoothie will load the Max Z travel value you tell it in the config file. So at the home location Z is actually 353.xx mm from the nozzle (as the case is with my printer) In other words at the home location for Z (Z max) the G90 value for Z is 353.xx mm not 0.
This way I do not have to probe the bed before every print. Just a G28 and M375 and it is ready to go.
@Kyle1 what is the printer btw?
@jerryflyguy It is a custom build. Over 18 months of design and fabrication went into making it possible.
Best z probe method. I would have gone that way too but I decided to go with non heated bed for cost saving (billing) I knew I needed to print a lot of 30+ hr print