Can I use a standard ink refill?

Yes. The Moleskine Smart Pen uses a standard D1 mini refill that is widely available in various formats and colors.
The refill included is a D1 by Zebra.
We can provide a recommended refill list to guarantee the best performance of the Moleskine Smart Pen: Ncoded technology uses carbon ink, so all other strokes need to be carbon-free in order to not affect recognition precision.
We recommend a Zebra 4C pen tip, which is the default pen tip for the Moleskine Smart Pen (decent recognition guaranteed).
Please note that Moleskine Smart Pen refills aren't available for purchase from Moleskine.
Recommended Smart Pen Refills:
RECOMMENDED SMART PEN REFILLS
ZEBRA - 4C TYPE
(Moleskine Smart Pen default pen tip)
MITSUBISHI - SE TYPE
KAWECO
PARKER
PILOT
STAEDTLER
SAILORPEN
ROTRING
CARAN DACHE
KYOCERA
SHACHIHATA
VISCONTI
YARD-O-LED RETURN TO ASSISTANCE