Start printing when (extruder) temperature is reached

I have seen a post a while back about this (I think) but for the life of me I can't find it anymore.
What I want to achieve is that the printer starts printing if the extruder temperature is reached. (for the first time)

My extruder temp alway overshoots a couple of degrees (dispite PID tuning) when heating up. Then it needs to come down a couple of degreed and only starts printing when it (slowly) reaches target temp (approaching from the top, so to say). I would like to have it start printing (or prime-blobbing) when it first reaches the target temp... I don't mind the overshoot in the Prime-blobbing phase...

anybody any ideas on how to achieve this?
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