[Solved] A user writes the following G-code to turn on the cooling fan at half speed:M106 S128But the fan does not turn on. What is the likely error? | 3D Printing

3D Printing - G-code Fundamentals

A user writes the following G-code to turn on the cooling fan at half speed:

M106 S128

But the fan does not turn on. What is the likely error?

AThe printer firmware might require a different command or fan pin setup

BThe S value should be between 0 and 255, 128 is invalid

CThe command should be M104 to control the fan

DThe G28 command is missing before M106

Step-by-Step Solution

Solution:

Step 1: Understand M106 command and S parameter
M106 controls the cooling fan speed with S value from 0 (off) to 255 (full speed). S128 is a valid half speed.
Step 2: Consider why fan might not turn on
If the fan does not turn on, it is likely due to printer firmware settings or hardware configuration, such as fan pin assignment or disabled fan control.
Final Answer:
The printer firmware might require a different command or fan pin setup -> Option A
Quick Check:
M106 S128 valid but hardware/firmware may block fan [OK]

Quick Trick: Check firmware and hardware if M106 S128 doesn't work [OK]

Common Mistakes:

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