What printer needs is tips? I'm not kidding! (3)
I believe the answer is:
ink
'what printer needs' is the definition.
I can't tell whether this defines the answer.
'tips? i'm not kidding' is the wordplay.
'tips?' suggests taking the first letters (I've seen 'tip of' mean this).
The initial letters of 'im not kidding' is 'INK'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for ink that I've seen before include "Liquid in pens" , "Material used in printing" , "It is ejected by cuttlefish" , "Writing material" , "Cuttlefish's secretion" .)