liquid handler dispense (lh.dispense) removes liquid from tracker even if action fails

[chuandudx]

We tried running a script to:

• pick up 200 uL from a well
• dispense 60 uL into another well

We incorrectly set the target well initially, leading to failed dispense actions.

After 3 attempts, PLR's tracker thinks we only have 20 uL left (3x60 uL dispensed) when we haven't dispensed any liquid.

[rickwierenga]

how did the dispense fail? could you share the specific error? depending on the error, the plunger might have moved down.

[chuandudx]

The dispense failed with the error:
First we have a ChannelizedError(errors={0: PositionNotReachableError...}) when we try to dispense

Then when we run it again towards the correct well:

• TooLittleLiquidError: Tracker only has 0uL

Our current workaround is set set_volume_tracking(False)

Thank you!

[rickwierenga]

fixed with #429. could you please confirm it works for you?

[chuandudx]

Thank you for the quick fix, Rick! We will verify by the end of this week!