The firm, formerly known as Dittoprint, hopes the investment will take it into the PrintWeek Top 500 by adding at least 2m to its current 3.3m turnover.
It is replacing a four-year-old four-colour press but will retain a five-colour Speedmaster 74.
It is also adding a second buckle folder and Polar 92ED with Transomat powerlift and jogger.
The firm prints match programmes for both Rangers and Celtic, and chief executive Jim Watt said the new press would enable it to turn around the Rangers job in three hours.
DP21 employs more than 50 staff and also has digital printing capacity.
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Latest comments
"Sorry to read this, a big name to go down, hopefully a lot of the £1.8M was insured. We are recruiting operational staff & currently in-talks to assist the clients with immediate requirements."
"£1.8m !! Very big numbers indeed."
"Now black really is white. Ditching a product line with all its consequences for customers is now an award winning move. Priceless!"
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