I'll try to give all the info I know. I'm not a programmer, so the answer might be obvious to some but not me.

All I know is I think this is the official repository of Marlin for Solidoodle https://github.com/mlaws/solidoodle2-marlin

and this guy here tells how he added the M98/M99 commands ( Neil Martin ): https://groups.google.com/forum/#!to...le/MNnym1MC94Y in there he also posted the modified source files which I guess would work with that version of Marlin current for that time (2012).

But looking at the latest source files, I can find the files Hysteresis.cpp and Hysteresis.h with copyright mentioning the name of Neil Martin, but not the lines he mentioned adding in other source files for this to work (Step 1 and Step 2 in his post from that link), so I just assume it was removed/deprecated.

I would just add the changes he says is needed to add that feature, but his post is from 2012 and the code might have changed for that to work the same way.