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Systems and methods for making ice utilize self-demolding ice molds. Responsive to freezing of water in the mold into ice, an ejection apparatus is compressed. Via a force arising from the compression, the ejection apparatus ejects the ice from the mold. Ice machines may utilize multiple molds, and

Systems and methods for making ice utilize self-demolding ice molds. Responsive to freezing of water in the mold into ice, an ejection apparatus is compressed. Via a force arising from the compression, the ejection apparatus ejects the ice from the mold. Ice machines may utilize multiple molds, and water filling a first mold may be utilized to at least partially melt ice in a second mold to facilitate ejection of the ice from the second mold.

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1. An ice formation apparatus, comprising: a mold configured with an ice cavity wherein water is freezable into an ice cube;an ejection apparatus disposed within the ice cavity, the ejection apparatus comprising a compressible material configured to eject the ice cube from the ice cavity responsive

1. An ice formation apparatus, comprising: a mold configured with an ice cavity wherein water is freezable into an ice cube;an ejection apparatus disposed within the ice cavity, the ejection apparatus comprising a compressible material configured to eject the ice cube from the ice cavity responsive to freezing of the water in the ice cavity; anda warming apparatus disposed in thermodynamic communication with the mold. 2. The apparatus of claim 1, wherein the ice cavity is configured with a trapezoidal profile with tapered walls, and wherein a bottom of the ice cavity has a planar cross-sectional area that is less than a planar cross-sectional area of a top of the ice cavity. 3. The apparatus of claim 1, wherein the ejection apparatus further comprises at least one of a spring or an air pocket. 4. The apparatus of claim 1, wherein the ejection apparatus occupies between 6 and 8 percent of a volume of the ice cavity. 5. The apparatus of claim 1, wherein the warming apparatus comprises a second ice formation apparatus in thermodynamic communication with the mold and configured to receive water in preparation for freezing, whereby a frozen ice cube in the ice cavity of the mold may be at least partially melted and ejected from the ice cavity of the mold. 6. An ice formation apparatus, comprising: a mold configured with an ice cavity wherein water is freezable into an ice cube; andan ejection apparatus disposed within the ice cavity, the ejection apparatus configured to eject the ice cube from the ice cavity responsive to freezing of the water in the ice cavity, wherein the ejection apparatus comprises: a compressible ejection element configured to exert an ejecting force responsive to compression of the compressible ejection element; anda flexible smoothing element configured to prevent ice from adhering to the compressible ejection element. 7. The apparatus of claim 6, wherein the ejection apparatus further comprises: a retention element comprising a washer whereby the flexible smoothing element is retained in mechanical communication with the mold. 8. The apparatus of claim 7, wherein the ejection apparatus further comprises: a shaping element disposed annularly outward of the compressible ejection element, the shaping element configured to shape the ice cube. 9. The apparatus of claim 8, wherein the shaping element comprises a circular washer having an angled face configured to direct forming ice toward contact with the compressive ejection element. 10. The ice formation apparatus of claim 8, wherein the shaping element extends a greater distance into the ice cavity at an annularly outward edge than at an annularly inward edge. 11. A self-demolding ice machine, comprising: a first ice formation apparatus and a second ice formation apparatus disposed about a common axis of rotation, each ice formation apparatus comprising: a mold configured with an ice cavity wherein water is frozen into an ice cube; andan ejection apparatus disposed within the ice cavity, whereby the ice cube is ejected from the ice cavity;a filling apparatus having a water supply alternately conveyable to the first ice formation apparatus and the second ice formation apparatus;a sensing apparatus configured to sense that water has frozen in at least one of the first ice formation apparatus and the second ice formation apparatus; andan escapement disc comprising a circular member fixed about the common axis of rotation relative to which the first ice formation apparatus and the second ice formation apparatus are rotatable,wherein the filling apparatus is configured to selectably fill the first ice formation apparatus or second ice formation apparatus in response to rotating of the first ice formation apparatus and second ice formation apparatus relative to the escapement disc. 12. The machine of claim 11, wherein the sensing apparatus comprises: a float valve configured to buoyantly float in water in the mold; andan escapement disc slot disposed partially radially through the escapement disc and configured to receive a shaft of the float valve. 13. The machine of claim 12, wherein the sensing apparatus further comprises a switch connected in mechanical communication with the float valve whereby the position of the float valve may be assessed to ascertain whether the water is liquid or frozen. 14. The machine of claim 11, wherein the second ice formation apparatus is configured to at least partially melt an ice cube disposed in the first ice formation apparatus in response to the filling apparatus conveying water to the second ice formation apparatus. 15. The machine of claim 11, wherein the first ice formation apparatus comprises a plurality of ice cavities.