How would you modify fan control code to reduce fan speed gradually from 255 at layer 10 to 0 at layer 20?

hard📝 Application Q9 of 15

3D Printing - Advanced Print Settings

Afan_speed = min(255, (layer - 10) * 25)

Bfan_speed = 255 if layer < 10 else 0

Cfan_speed = max(0, 255 - (layer - 10) * 25)

Dfan_speed = (20 - layer) * 25

Step-by-Step Solution

Solution:

Step 1: Understand gradual decrease formula
From layer 10 to 20, fan speed decreases linearly from 255 to 0. Each layer reduces speed by 255/10 = 25.5 (approx 25).
Step 2: Check each option
D subtracts (layer-10)*25 from 255 and clamps at 0, correctly decreasing speed. B sets speed abruptly. C can go negative without clamp. A increases speed instead of decreasing.
Final Answer:
fan_speed = max(0, 255 - (layer - 10) * 25) -> Option C
Quick Check:
Gradual decrease uses subtraction and clamp [OK]

Quick Trick: Subtract scaled layer difference from max speed [OK]

Common Mistakes:

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