Ice formation

1. A frozen substance maker for forming a clear ice formation from a liquid, the frozen substance maker comprising:

a heat pump being configured to perform heat transfer;

a cold plate in thermal communication with the heat pump and having an inlet configured to receive the liquid;

a mold base positioned on the cold plate, the mold base and the cold plate defining a seed crystal chamber, the seed crystal chamber being in fluid communication with the inlet and being configured to hold a first portion of the liquid, the mold base having a seed crystal conduit in fluid communication with the seed crystal chamber;

a mold top positioned on the mold base, the mold base and the mold top defining a mold chamber, the mold chamber being in fluid communication with the seed crystal chamber via the seed crystal conduit, the mold top defining an overflow reservoir in fluid communication with the mold chamber, the mold chamber being configured to hold a second portion of the liquid; and

an agitator located at least partially within the overflow reservoir,

wherein the seed crystal chamber is configured to form the first portion of the liquid into seed crystal ice in the seed crystal conduit in response to the heat transfer, and

wherein the mold chamber is configured to form the second portion of the liquid into the clear ice formation from the seed crystal ice in the seed crystal conduit in response to the heat transfer.

2. The frozen substance maker of claim 1 , further comprising a seed crystal chamber sensor that determines whether gas, liquid, or frozen substance is present in the seed crystal chamber.

3. The frozen substance maker of claim 1 , further comprising a mold chamber sensor that determines whether gas, liquid, or frozen substance is present in the mold chamber.

4. The frozen substance maker of claim 1 , further comprising an overflow reservoir sensor that determines whether gas, liquid, or frozen substance is present in the overflow reservoir.

5. The frozen substance maker of claim 1 , further comprising: a supply reservoir; and a pump in fluid communication with the supply reservoir and in fluid communication with the seed crystal chamber via the inlet.

6. The frozen substance maker of claim 5 , wherein the mold top comprises a channel in fluid communication with the overflow reservoir, the channel having an outlet configured to connect with the supply reservoir.

7. The frozen substance maker of claim 1 , further comprising a cap located above the mold top, the cap defining a fill/drain channel in fluid communication with the overflow reservoir.

8. The frozen substance maker of claim 7 , further comprising a motor located on the cap, the agitator being positioned on the motor.

9. The frozen substance maker of claim 1 , further comprising: a heat sink including fins; and a fan positioned to encourage air to flow past the fins, wherein the heat pump includes a thermoelectric cooler.

10. The frozen substance maker of claim 1 , wherein the mold base comprises a thermally conductive material including a flexible/compliant coating facing the mold chamber; and wherein the mold top comprises a flexible/compliant material.

11. The frozen substance maker of claim 1 , wherein the mold base is selectively removeable from the cold plate.

12. The frozen substance maker of claim 1 , wherein the supply reservoir is selectively removable.

13. The frozen substance maker of claim 1 , wherein the mold base comprises fill channels communicating the seed crystal chamber with the mold chamber at an interface between the mold top and the mold base.