Here is a concise summary of the provided text:
**Title:** Gambiarra (Episode 3) - Tech Showcase
**Featured Items:**
1. **Plastic Bottle Rocket Launcher**: A device that turns a plastic soda bottle into a rocket using compressed air and water as fuel.
2. **Autonomous Sand Drawing Machine**: A magnetic bed that controls a metal ball to create drawings in sand, offering a unique relaxation experience.
3. **The Most Multifunctional Pen in the World**: A pen that:
* Writes
* Has a built-in ruler (with inch and millimeter markings)
* Functions as a touchscreen stylus
* Includes a Philips screwdriver head (hidden within the pen)
**Summary:** The episode showcases these three innovative, yet quirky, tech products, with the hosts demonstrating and reacting to each item's unique features.
Here are the key facts extracted from the text, numbered and in short sentences:
**Device: Plastic Soda Bottle Rocket**
1. A device can turn a plastic soda bottle into a rocket.
2. The device uses water and compressed air as fuel.
3. A pump is used to blow compressed air into the bottle.
4. The device has a trigger that, when pulled, launches the bottle.
**Machine: Autonomous Sand Drawer**
5. A machine can draw autonomously on sand.
6. The machine uses a magnetic bed to control a metal ball.
7. The metal ball creates designs on the sand.
8. The machine requires a power source (a socket).
**Multifunctional Pen**
9. A pen exists with multiple functions beyond writing.
10. The pen has a built-in ruler with inch and millimeter markings.
11. It works as a stylus for touchscreen devices.
12. The pen has a non-eraser tool on the back (not for erasing).
13. The back part of the pen doubles as a Philips screwdriver.
**Miscellaneous**
14. The devices and products were showcased in an episode of "Gambiarra".
15. The hosts tested the plastic soda bottle rocket and had initial failures before reading the manual.
16. The autonomous sand drawer required patience and correct setup to produce desired results.