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preheat: improve target temperature threshold
Use 5°C threshold to be consistant with other parts of the firmware. Relying on 95% of the target temperature creates a dependency on the temperature: PLA: Target = 215°C, threshold = 10.75°C PETG: Target = 230°C, threshold = 11.5°C ABS: Target = 255°C, threshold = 12.75°C ASA: Target =260°C, threshold = 13.0°C PC: Target = 275°C, threshold = 13.75°C My proposal is we instead use a constant TEMP_HYSTERESIS = 5, which is consistent with M109, and behavior when restoring print from RAM and some of the MMU code (like unload function) Change in memory: Flash: +2 bytes SRAM: 0 bytes
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