# Is there a way to enter distortion values manually in unrechable Z-Probing areas

So matrix distortion measurement is limited to Y > 28. Ymin for the matrix is therefore 28.

In the area of Y=0 there are little bumps I like to be corrected also.

Do you see a chance of a workaround (including software mods) to manually define distortion correction values for the line Y=0?

Thanks!

## Comments

The measurement is done in distorion.cpp in this function:

When you make for (iy = 0; iy < DISTORTION_CORRECTION_POINTS; iy++) start with iy = 1 it would maybe work, but complete y=0 row has then no set values. That is the best I can offer.

I plan to mod it in like this:

G33 L0

lists all commands to restore. So take them for y min and modify Z for replay.