The heater is maybe only 30 Watts and you probably have strong part cooling fans running which cause a cooling of the nozzle (especially if you are close to the print bed) and your heater just cannot handle fast enough. I increased the tolerances for heater errors and did the PID for low...
## PID tune [extruder] and [heater_bed] sections ## Fine tune E steps [extruder] section [mcu] ## Uncomment below if you're using the Raspberry uart0 to communicate with Spider #restart_method: command ## You need to select 'Communication interface' to USB in 'make menuconfig'...