Wherever it comes from, the power is used to melt metal, so the power puts an upper limit on how fast material can be printed. I don't know what percentage of

Wherever it comes from, the power is used to melt metal, so the power puts an upper limit on how fast material can be printed. I don't know what percentage of the plasma energy in RPD is transferred to the metal, but fiber or CO2 lasers are significantly less efficient than electron beams (~40% vs ~70% absorption based on a very brief search).