Calculate the Total Cost of Ownership (TCO) by factoring in the initial purchase price, consumable costs (diamond styli), and energy consumption. High-end machines often offer energy-saving servo motors that reduce operational costs by 20%. Evaluate the engraving speed (m²/h) against your output requirements; a faster machine may have a higher upfront cost but significantly reduces the lead time per cylinder, allowing for higher throughput and faster ROI. Always inquire about the availability and cost of replacement parts like lead screws and engraving heads.