Ok, So been learning sketchucam and seems ok, especially on osx and inside sketchup, dream coming true, nice. But am having some troubles getting exact drawing to reality scaling. the skp jpeg shows a test piece with 2.5mm bars with 2.5mm spacing, when tool path generated as shown it does show exactly the tool offset, in this case the bit measures 2.2mm (checked with quality calipers)so a 1.1 path distance, all good. but when cut as shown in photo jpeg the bars are measuring 2.2mm and a 2.8 gap, and this varies as you can see by eye the bar on the outside edge is 1.7mm! Ive looked through all options , played with G61 and G91.1, but cant seem to see anything else relating to scale or offsetting.. So whadda ya reckon?