Average draw — Ender 3 ≈ 120W, Bambu X1 ≈ 150W.
Recommended Etsy / eBay price
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Cost to make: — · Profit per unit: —
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Total cost = filament + electricity + machine amortisation + labour + post-processing, with the whole stack scaled up by the failure rate (so successful prints absorb the cost of failed ones).
Etsy / eBay price = cost × (1 + margin). For pricing competitively, look at finished listings on those marketplaces — these numbers are your floor, not your ceiling.