New Mcode: M493.3 Set Tool Length Offset M493.4 report tool length offset

[faecorrigan]

M493.3 has two parameters, H{offset} and Z{new value}

If the z parameter is provided, the firmware will directly set the TLO value to the new number. M493.3 Z-15 would set the current TLO to -15

If the H parameter is set, the TLO will be set as a function of an {offset} above the current Z0 for the WCS. M493.3 H5 - set the tlo manually using an endmill or gauge pin of a known diameter, in this case 5mm, that rests on the Z0 surface.

M494 reports current TLO to console for debugging

[faecorrigan]

implement M493.3 save tool offset to particular value

[faecorrigan]

Set tool length offset without atc sensor M493.4 H{offset}

[faecorrigan]

manual tool changes for T#7-99