Printed on a Replicator 2, PLA with a triple wall and 20% fill. It took about 6 hours to print. This is by far the best solution I have found so far for holding blank PCB's while I mill them on my ZTW1212.
That looks great! I also have a ZTW12x12 but the bed is not quite flat or level enough to mill SMT boards bigger than a few inches across. Does this clamp help?
Does the PCB get damaged when you are cutting out the board (since the board is not supported underneath)?