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Thinkyhead
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Roxy
I would not remove the heater code. I would just relax it so it doesn't do anything.
Setting TEMP_SENSOR_BED to 0 disables the heated bed. I believe Marlin will complain if you set all TEMP_SENSOR_n settings to 0. It wants at least 1. Roxy, I wonder if it's worth modifying Marlin to allow zero temperature sensors, since I see more users all the time who would like to do paste extrusion or ceramics.
Yeah... Forcing there to be at least one seems like an arbitrary restriction. There are going to be some machines that really don't need any.