Stepper driver ICs like the A4988 and DRV8825 generate significant heat above 0.8 A. Without cooling, thermal overload protection triggers at around 150 °C, shutting down the stepper and halting your print.
Various Sizes Alu Heatsink Heat Sink Cooling Fin Cooler Heatsink Heat Management
Alu Heatsink Heat Sink Cooling Fin Cooler Heatsink Heat Management Various Sizes
Alu Heatsink Heat Sink Cooling Fin Cooler Heatsink Length 200MM-300MM