A G-code file has the line G1 X100 Y100 E-5 F1500 but the printer does not retract filament. What is the problem?

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3D Printing - G-code Fundamentals

A G-code file has the line G1 X100 Y100 E-5 F1500 but the printer does not retract filament. What is the problem?

AExtruder temperature is not set

BNegative extrusion values are not supported by the firmware

CThe command should be G28 for retraction

DThe speed F1500 is too slow for retraction

Step-by-Step Solution

Solution:

Step 1: Understand extrusion values
Negative E values mean filament retraction, but not all firmware supports negative extrusion.
Step 2: Identify why retraction fails
If firmware ignores negative E, no retraction occurs.
Final Answer:
Negative extrusion values are not supported by the firmware -> Option B
Quick Check:
Negative E unsupported = No retraction [OK]

Quick Trick: Check if firmware supports negative extrusion for retraction [OK]

Common Mistakes:

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