Fingers crossed it'll cut ally

[Jonathan]

Interesting stuff. You could stick a sheet of whatever plastic you're using down to the bed and mill slots/holes for the air ... then flip it over and cut out a grid of rings to fit your O-rings. Might be worth thinking about what pattern of rings would hold things best - some bigger than others? Could have rectangular ones, all sorts!

I might have a go at this, got some 6mm acrylic that would do the trick. Got plenty of O rings from £1 shop. Some might be big enough.

With a sufficiently big syringe how many pads do you think could be served? Or are you sucking the air out of one at a time and swapping the syringe round?

I'm looking at the servo controller now. I've traced the PCB and drawn circuit diagram of the interesting bits. The problem is the one you sent me has one significant difference to yours - mine gets 3.3v for the microcontroller and potentiometer via a 3.3v voltage regulator. I think yours is either a 5v microcontroller, or they're getting 3.3v via a voltage divider....

Could you measure the maximum voltage from between R32 and ground on the PCB please? I may have asked you to do that already, this thread is so long I'm not sure!
Also what resistance is your potentiometer - it says on the metal case (FB5k ... i.e 5k ohms for mine)?

Edit: don't worry about the voltage, post #90! Except was that definitely the voltage from the resistor to ground, not across the resistor?