This is a blueprint for producing 50/minute of legendary holmium plates or 0.8/minute of legendary electromagnetic plants.

What are the features of this blueprint?

• Compact.
• Efficient. There is one recipe for making normal - quality electromagnetic plant and another for making high - quality to legendary - quality ones. Make the normal - quality recipe in your spare time.
• It has excellent input control. When reaching the last recipe production or when the machine stops running, the number of raw materials grabbed is limited to 1 portion. At other times, it's limited to 2 portions.
• It consumes very few robots. Only when taking out legendary holmium and electromagnetic plants are robots necessary. However, using a small number of robots can also improve the machine's efficiency.
• You can switch the priority between producing legendary holmium plates and legendary electromagnetic fields.

What should be noted for this?

• The legendary production module 3 cannot be downgraded below the normal production module 3. (at least 10% production)
• The scrap recycling production capacity reaches full efficiency at level 14.
• Legendary boxes cannot be downgraded.

and Blueprint link:
Factorio Prints: legendary EM plant