The Nostalgia Pen is the result of trying to mimic the design of the pen that I used as a San Francisco public school student in the 1960s, when learning handwriting (cursive). The universally used pens, which signified a rite of passage, were dark green and a little longer.
This pen requires a very inexpensive (10 for $1.39 at Target) BIC Stic pen refill
The pen can be printed as 1 or 2 piece(s), with or without ridges in the grip. I found that 2 pieces allowed for more successful refill removals, because pushing is safer than pulling, The tip tends to separate from the ink tube.
Don't even think about printing without a raft!