S3D Bed Leveling

[hebbster]

Laptop crash & had to set up a new machine, when i print with this new one using S3D first layer is off. Nearly scraping the bed on one side & air print on the other. Initially used cura on the new machine but still want S3D as an option.

Guess I'm having a little trouble getting my head around how leveling occurs w/ S3D. Isn't there built in leveling on the Rambo board? Should there be a G29 code in the initial script?(doesn't seem to be by default) There's also the S3D leveling wizard, but have yet to totally figure out how that works. What do other folks use to level?

For that matter always annoyed that it sometimes doesn't preheat the hot end at the same time as the bed (does afterwards), assuming M109...