STEM連繫 2.3STEM connection 2.3製作省水裝置Making a water‐saving device
學習技能：Learning skill:
立體打印3d printing
DIYDIY
難度﹕Difficulty:
★
時間﹕Time:
1 節課1 lesson
物料Materials
步驟Procedures
1. 使用美工刀在瓶蓋上剪出一個圓形。
1. Use a cutter to cut a circle around the top of the cap.
2. 使用錐在瓶蓋兩邊各開一個小孔。
2. Use an awl to make a hole on one side of the cap and another on the opposite side.
3. 剪出煲湯袋，用膠水把它貼在瓶蓋上。重複步驟加上 3-4 層煲湯袋。
3. Cut the food filter bag and stick it on the cap with glue. Repeat the step to add 3–4 layers of food filter bag.
4. 把橡皮圈穿過瓶蓋上的小孔並綁好。你已製成一個省水裝置！
4. Insert the rubber band to the holes of the cap and tie it up. A water‐saving device is done!
如何使用How to use
使用省水裝置前Before using the water‐saving device
把水龍頭打開 5 秒。Turn on the water tap for 5 seconds.
水的體積 ≈ 450 mLVolume of water ≈ 450 mL
使用省水裝置後After using the water‐saving device
把省水裝置固定在水龍頭Fix the device to the water tap.
把水龍頭打開 5 秒。Turn on the water tap for 5 seconds.
水的體積 ≈ 400 mLVolume of water ≈ 400 mL
評估及改良Evaluate and improve
Suggest how you can improve the design of the water‐saving device with the aid of a diagram.
附加資源Further resources
3D 打印3D printing
如果學校有3D打印機，你可以在我們的網站下載可供3D打印的模型。如果你會使用3D製圖軟件（例如
Blender），更可以設計和製作自己的3D打印模型。
If 3D printers are available at your school, you can download free models for 3D printing from our website. If you are familiar with 3D graphic tools (e.g.
Blender), you can also design your own 3D-printed models.