I wanted to find out what differences were made with different settings for a diamond drag tool using the Quick Engrave toolpath and an offset fill, so I ran this test on a piece of 1/4" acrylic.
The Photo shows that although there are not major differences with various tool depth and line stepover settings, the best result seems to be with the lightest setting and the largest stepover. (Also, the largest stepover will take the least time to cut.)
The drag tool was purchased on E-bay. http://www.ebay.com/itm/CNC-DRAG-ENGRAV ... SwPc9WzRo0
Good judgement comes from experience.
Experience comes from bad judgement.