Calculating 3DES Key Check Value (KCV)
Three problems here:


The online tool used expects a 24-byte (48 hex-character) key; thus you should enter E6F1081FEA4C402CC192B65DE367EC3EE6F1081FEA4C402C as the key, duplicating the first 8 bytes; this is the customary way to extend a two-block triple DES key of 16 bytes to a three-block triple DES key of 24 bytes.
You gave 16 bytes (32 hex chars) as input, which is twice as many bytes as required; this doesn't affect the computation of the KCV though.
The KCV value is supposed to be the first 3 bytes (6 hex chars) of the result, not 4 bytes (8 hex chars).


When this is fixed, the KCV 212cf9 is correctly obtained using the tool.

Note: it is a bad idea to use an online tool in order to check a real key, just like it is a bad idea to use an online RNG to generate a real key.