# Ep 156: 3D-Printing Rainbows, Split-Flap Clocks, Swapping EV Car Batteries, and Floppy Time

- Show: [Hackaday Podcast](https://hardwarepodcasts.com/podcast/hackaday-podcast)
- Published: 2022-02-18
- Length: 45m
- Episode: 156
- Page: https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-18-ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-flop
- Listen: https://hackaday.libsyn.com/ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-floppy-time

## Summary

Hackaday Editor-in-Chief Elliot Williams and Assignments Editor Christina Potos discuss a variety of hardware hacks, including Alfredo Cordellini’s automated split-flap clock, Carl Bajiga’s flexible PCB heaters, and Sasha’s IoT-controlled filament dry box. They also cover Action Lab’s 3D-printed diffraction gratings, Zarland University’s conductive ink sketching device, and Yon Derogi’s floppy disk clock. The episode concludes with a deep dive into Lewin Day’s article on battery-swapping EVs in China and Dan Maloney’s review of trinocular microscopes.

## Chapters

- [0:02](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-18-ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-flop#t=2) Introduction and Keyboard Discussion
- [6:54](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-18-ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-flop#t=414) Alfredo Cordellini’s Split-Flap Clock Hack
- [11:00](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-18-ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-flop#t=660) Carl Bajiga’s Flexible PCB Heaters
- [13:42](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-18-ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-flop#t=822) Sasha’s IoT Filament Dry Box
- [19:28](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-18-ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-flop#t=1168) 3D-Printing Rainbows with Diffraction Gratings
- [21:32](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-18-ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-flop#t=1292) Zarland University’s Conductive Ink Sketching Device
- [24:59](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-18-ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-flop#t=1499) Yon Derogi’s Floppy Disk Clock
- [26:11](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-18-ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-flop#t=1571) Quick Hacks: AR Lathe, Grid Frequency, and Macro Pad
- [32:04](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-18-ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-flop#t=1924) Battery Swapping EVs in China
- [36:28](https://hardwarepodcasts.com/podcast/hackaday-podcast/2022-02-18-ep-156-3d-printing-rainbows-split-flap-clocks-swapping-ev-car-batteries-and-flop#t=2188) Dan Maloney’s Microscope Review

## Topics

- [Prototyping & iteration](https://hardwarepodcasts.com/topic/prototyping)
- [Mechanical engineering](https://hardwarepodcasts.com/topic/mechanical-engineering)
- [PCB design & layout](https://hardwarepodcasts.com/topic/pcb-design)
- [Materials & manufacturing processes](https://hardwarepodcasts.com/topic/materials-and-processes)
- [Energy & climate tech](https://hardwarepodcasts.com/topic/energy-and-climate-tech)
- [Test & measurement](https://hardwarepodcasts.com/topic/test-and-measurement)

## Most relevant to

makers and hobbyists

## Mentioned

- Alfredo Cordellini (other)
- Solari (product)
- Carl Bajiga (other)
- Sasha (other)
- ESP32 (chip)
- N8N (other)
- Thomas Senladerer (other)
- Action Lab (other)
- PLA (material)
- Zarland University (other)
- Narius Por Jafarian (other)
- Raspberry Pi (chip)
- OV52 (chip)
- Yon Derogi (other)
- Nokia (product)
- Ken Vandervelden (other)
- FNnet/grid (other)
- Logitech (company)
- Pinafau Pluvenage (other)
- Lone Soul Surfers (other)
- Lewin Day (other)
- Tesla (company)
- Dan Maloney (other)
- Xbox (product)

## Related episodes from other shows

- [3D Printed Shark Jumps - Edifying Edison's Energy](https://hardwarepodcasts.com/podcast/the-amp-hour/2014-09-24-3d-printed-shark-jumps-edifying-edisons-energy) (The Amp Hour)
- [T-26-012 : Founders From The Show Floor - CES 2026](https://hardwarepodcasts.com/podcast/tradeoffs/2026-02-04-t-26-012-founders-from-the-show-floor-ces-2026) (TRADEOFFS)
- [Pneumatic Tubes, Straight To The Home](https://hardwarepodcasts.com/podcast/the-amp-hour/2024-01-22-pneumatic-tubes-straight-to-the-home) (The Amp Hour)
- [030 - Supercon 2019](https://hardwarepodcasts.com/podcast/unnamed-reverse-engineering-podcast/2019-12-01-030-supercon-2019) (Unnamed Reverse Engineering Podcast)
- [033 - All Over the Place](https://hardwarepodcasts.com/podcast/unnamed-reverse-engineering-podcast/2020-04-27-033-all-over-the-place) (Unnamed Reverse Engineering Podcast)

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