I carve some plexi then fill the carving with some resin.
That resin makes bump (lump ? dent ? ok : i have to put far moreresin that geometrically needed, in order to make sure no light will appears on borders of the carving).
After the resin get hard, i want to remove the excess of resin.
The bump may be 2mm height approx. I set up a pocket, saying 1.7mm of depth. One pass.
I want to travel the stock at 3/10th of mm of altitude ABOVE the stock which should not be touched. That's why i keep a 0.3 mm above it.
When i go to the screen, i cannot set a negative -2mm for the position of the model, in order to have the mill flying at .3mm above the stock.
You do not allow users to set a negative value.
For now the machining is so simple, i will manually change all the Z. ..
But for sake of simplicity, can you plan a way to solve this ?
For me it will be very frequent, and will be too hard for complicated shapes.
What do you think about that ?