Thanks to Nemo's help in the [Wanted] Thread there's now a new guide for modifying and installing an external waste ink kit on the Epson Stylus 2100 / 2200 model printers:
Epson 2100 / 2200 : Waste ink mod
Original thread ref:
http://www.continuousink.info/forum/viewtopic.php?t=4149
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Printers: (Canon) MP500/830, MX700, iP4000/4200/4300/4500/5200, iX4000(A3) (Epson) C84/86, D88, CX6600, R285/800/1900 (HP) K550, K850, K5400, L7680