Problem: When using my CNC router to engrave or route circuit boards, I always tend to run in to problems with the work piece not being completely flat or parallel with machine axes. This leads to changes in the depth of cut which are typically quite shallow for these operations. This causes the copper layer to not be cut all the way through for circuit boards, or if engraving plastic, will cause the plastic to melt if the depth of cut increases too much. Solution:
Is ther opto interface available? Like this one https://www.amazon.de/gp/product/B00MY0GRLK/ref=ox_sc_act_title_2?smid=A799JZAFWF3VR&psc=1