This issued happen on 1 line. But we must to reduce risk cause of Ramp damage. I think in case of Ramp presenter damage should be occurred when we push e-stop and Z-axis cylinder are release to move down to crack on presenter.
However, I fix by additional check valve to holding when pressing e-stop.
Per your recommend, I’m crosscheck with buyer (Wuttichai Pechkua (Tooling) Wuttichai.Pechkua@wdc.com) he told me, the new presenter (PEEK 1000) are cheaper than the old presenter about 30 us. But if you expect about structure has concern please you find out and change.