I can’t find the setting(s) that are limiting the Hotend temperature to 285C. I have a Micro Swiss Hotend with an NTC 3950 Thermistor (M3 screw-in type) and am using TEMP_SENSOR_0 13 in Configuration.h.
I have upgraded the bed to a HICTOP ~220x275mm (250W) and added a MOSFET and 350W Mean Well power supply to accommodate it. I’m sure it’s a heavy load when I heat the bed to 110-120C along with a Hotend of 260-285C, but I think I should be able to reach 290-295C without the firmware limiting me.
I don’t know whether this is related, but I also often have the firmware stop the printer with a thermal condition when I use a bed temperature over 110C (e.g. between 115C and 120C), especially when starting from a completely cold state of around 10-15C for both the bed and Hotend. One recent time when I heated bed to somewhere around 115C and the Hotend to 260C I noticed that after it reached 260C it jumped right to 285C and had to cool down from there. So I’m wondering if the thermal condition is caused by inaccurate temperature readings.