I started with an assumption there might have been a when component to that question, but nope, apparently we're taking about 2025 and not 1995.
Somewhat amazingly though, brand new dot matrix printers - not just new old stock, but newly-manufactured units including modern USB and/or Ethernet interfaces - and even the big cartons of tractor-feed continuous paper are still readily available.
As dot matrix printers have not gone the way of the dodo, also neither have carbonless triplicate forms, which they are uniquely able to print on. Seems that's still a big selling point for these printers.
It should be a great idea, but I feel like the quantities involved are too vastly different.
I'm seeing estimates of 300kW/hectare (30MW/km² or 77MW/mile²) for heating glasshouses. With individual datacentres frequently confirming multiple gigawatts, the land area required just doesn't match up.
This is not to say it isn't worth considering, but it would be a rounding error in the datacentre's heat output before you ran out of space to build more glasshouses.
There's a secondary concern of water consumption. You might extend that to ah but what if we could use that to grow the plants too? but the evaporated cooling water out of one of these systems tends to be anything but clean. Maybe that's a more solvable problem.