- md_technic.smelter_refractory_duration = tonumber(minetest.settings:get("md_technic.smelter_refractory_duration")) or 5000
- md_technic.smelter_min_burntime= tonumber(minetest.settings:get("md_technic.smelter_min_burntime")) or 30
- md_technic.smelter_speedup = tonumber(minetest.settings:get("md_technic.smelter_speedup")) or 1.5
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