How do I set/change my default printer?

Find out what printer is your default:

echo $PRINTER

If this does not output anything or is incorrect:

export PRINTER='printer-name'

where 'printer-name' is the printer you want to set:

a1, a1d, f2, f2d, f2suite, f2suited, f3, f3d, f4, f4d, s0, s0d, s1, s1d, s2, s2d

To find the nearest printer:

$ find_printer