Ice Tube Clock, meet the ChronoDot

[Alex] ramped up the precision of his timepiece by adding a ChronoDot to the Ice Tube Clock. These two items are among our favorites; the Ice Tube Clock for its old-style multi-digit display, and the ChronoDot for combining a DS3231, battery, and components into a nice small package.
There is a schematic link at the very bottom left of [Alex's] writeup. He mentions that he depopulated the clock crystal and its capacitor pair from the board and patched into the clock input on the AVR. A 100K pull-up resistor is included in the wiring as called for in the DS3231 datasheet. Although not specifically referenced, we assume that [Alex] reprogrammed the ATmega168 clock select fuses to use an external clock signal.
Now he can sit back knowing that the clock will be within 10 seconds per year accuracy.

Hot resistors used for color-changing clock face

[Sprite_TM] built a full clock display using thermochromic paint. This picks up where he left off with his paint-based 7-segment display prototype. He never really saw that design through to a finished project, but he recently came across the leftover paint and decided to do something with it. Instead of making thin traces on a PCB he’s heating up resistors mounted on protoboard. Each resistor has been coated with the black/light grey paint after getting a rough sanding on the tops of the packages. Run around 500mW through a segment and they heat up enough to change the paint to light grey. Once shut off, the segments gradually fade over the next 60 seconds.

Meter clock with pleasing design considerations

[AndyO] embraced his inner geek by building this meter clock. It exhibits a lot of features that you’d want to see in a home-built timepiece, include over-complexity, abundant features, and RGB LEDs. We’re fascinated by the design he put into this. For instance, the two indicator LEDs on the clock face are not poking through the surface, but use brass tubes as light pipes. Also, the three buttons on the top are almost indistinguishable, and have an RGB back light that places a halo around each. The case itself was built by first making a form, then laminating thin sheets of wood (a difficult task due to the tight curves). The needles themselves are not actually meters, like the clock the inspired the build, but are attached to servo motors. This all comes together into a fascinating build, and a great writeup.
[Thanks Graham]