I just learned about this Panasonic I2C Infrared 8x8 array sensor.
It might have useful applications for monitoring printing temperatures, bed heat or controlling cooling.:
http://pewa.panasonic.com/components/built-in-sensors/infrared-array-sensors/
http://www.youtube.com/attribution_link?a=MWIg-a6B-7g&u=/watch?v%3DAiYG-0rKyOE%26feature%3Dshare%26list%3DPL5F6C974BA02CC292
Temperature range for the Panasonic sensor is - 20 to 100°C, +/- 3°C accuracy, up to 10hz frame rate. It might not work for monitoring.
USB eval board ~$75 from DigiKey, sensor alone is ~$40 ea.
Melexis MLX90620 is a
16x4 array, - 20°C to 300°C, +/- 1.5°C accuracy between 0-50C. Frame rate up to 512 hz.
Eval board ~$370, sensor ~$84 ea. from DigiKey.
Getting either to work right requires attention to thermal design. Emissivity of the object you’re looking at changes the detected temperature, accuracy is reduced as frame-rates go up, etc.etc.etc…