Z probe needs probe offset settings

Controllers Smoothie
1

I like the Z probe idea for bed-leveling delta printers. I have a Rostock MAX, and I got an Azteeg X5 just so I could see how good Smoothieware’s autolevel is.

Unfortunately, there are no settings for me to tell Smoothieware the probe’s offset, so it assumes the probe is at the extruder nozzle. In actuality it’s about 50mm away, mounted on a far corner of the effector. Marlin and Repetier both have settings for this. When I run the bed leveling, it can get a calibration to within 30 microns, but since all the measurements are of points ~50mm from where they should be the result is terrible. It digs into the glass near X and lifts a good three layer heights near Y.

I looked through the source code but didn’t see any provisions for a probe offset. (Basically, it would add the X/Y offsets and take the Z offset into account for bed height calculation… not terribly hard.) Is anyone working on this?

Imported from wikidot

2

As I explained on IRC and will reiterate here for others. The way the delta calibration works on Smoothie the XY offset is not really needed, it works by using relative heights and a 50mm offset from where it thinks it is does not really affect the end results.

Z probe offset is handled by G30 Znnn. If you wanted to use thecprobe to set Z height although I recommend to do that manually.

As we discovered on IRC your issue was something else entirely.