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A user writes the command M106 S300 to control the fan speed. What is the issue with this command?

medium📝 Analysis Q6 of 15
3D Printing - G-code Fundamentals
A user writes the command M106 S300 to control the fan speed. What is the issue with this command?
AS value exceeds the maximum allowed, causing an error
BM106 does not control fan speed
CS parameter should be lowercase
DM106 requires an X parameter instead of S
Step-by-Step Solution
Solution:

  1. Step 1: Understand M106 and S parameter limits

    M106 controls fan speed with S value from 0 to 255.

  2. Step 2: Check the given S value

    S300 exceeds the maximum 255, which is invalid and causes an error or is ignored.

  3. Final Answer:

    S value too high for fan speed, causing error -> Option A

  4. Quick Check:

    Fan speed max = 255, S300 invalid [OK]
Quick Trick: Fan speed S max is 255, never exceed [OK]
Common Mistakes:
  • Using values above 255 for fan speed
  • Thinking M106 controls temperature
  • Confusing parameter letters

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