Please help! Tool Stays about 3mm Above Aluminum Surface After Zeroing

[MadManMilla (Jake Miller)]

This is the second post within a week describing an unwanted 3mm offset. Seems like a funny coincidence to me!

Initial cut way too deep

Hi All– I’ve run this file four times now, each time carefully setting the Z height and, after the first one, doing the rapid jog to 6 mm above the surface to test the setting, which was correct. Three times using the Bitsetter and once manually using the paper technique. In each case the bit dove into the piece to a depth of ~3mm on the first pass. Subsequent passes increased depth by the expected sub-millimeter increment. If I hadn’t hit the stop button it would have continues to cut into the…