Anything involving vision needs good contrast, white tape strips should be put on dark background, black tape strips on white background.Setting up OpenPnP takes some time, and even longer to become proficient, which I am not.I kept having problems using camera with OpenCV driver, the webcam driver seems more stable for me.Cameras need to mounted such that they are perpendicular to the build plane, and life is easier if they are square to mechanics.The down looking camera needs to have lens calibration/alignment done before installing.Mechanical design should be done such that PCB and strip feeders at same Z height such that camera focus is correct.A4988 step sticks from china have high failure rate, took 8 to get 5 working ones.A4988 Step Sticks from china are limited to 1A not 2A! I kept wondering why I could not get speed out of my machine.Speaking of which here are some lessons learned. This was before I learned that the PCB and strip feeders need to be at same height. One thing I like about the head design is the drag chain rests on the extrusion, sounds silly until you try and figure out how use drag chain when it can not rest on extrusion. As far as an update on the machine goes here is a picture from last night.

Cohesion3d