For example, S3D generated a bunch of E-1 F3 slow retracts at the edge retracts in the following picture: Attached is the stl and the fff.

Here's the gcode where the super slow retracts occur (notice the bunch of E-1.0000 F3):

G1 Z1.250 F180

G1 E1.0000 F600

G1 X141.298 Y175.798 E0.0003 F2376

G1 X141.302 Y175.802

**E-1.0000 F3**

G1 Z1.350 F180

G1 X143.298 Y175.465 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X143.302 Y175.469 E0.0003 F2376

G1 X143.298 Y175.465

**E-1.0000 F3**

G1 Z1.350 F180

G1 X147.298 Y175.575 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X147.302 Y175.579 E0.0003 F2376

G1 X147.298 Y175.575

**E-1.0000 F3**

G1 Z1.350 F180

G1 X149.301 Y175.245 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 E-1.0000 F600

G1 Z1.350 F180

G1 X151.298 Y175.686 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X151.302 Y175.690 E0.0003 F2376

G1 X151.298 Y175.686

**E-1.0000 F3**

G1 Z1.350 F180

G1 X153.298 Y175.353 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X153.302 Y175.357 E0.0003 F2376

G1 X153.298 Y175.353

**E-1.0000 F3**

G1 Z1.350 F180

G1 X155.298 Y175.797 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X155.302 Y175.801 E0.0003 F2376

G1 X155.298 Y175.797

**E-1.0000 F3**

G1 Z1.350 F180

G1 X157.298 Y175.464 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X157.302 Y175.468 E0.0003 F2376

G1 X157.298 Y175.464

**E-1.0000 F3**

G1 Z1.350 F180

G1 X161.298 Y175.575 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X161.302 Y175.579 E0.0003 F2376

G1 X161.298 Y175.575

**E-1.0000 F3**

G1 Z1.350 F180

G1 X163.301 Y175.245 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 E-1.0000 F600

G1 Z1.350 F180

G1 X165.298 Y175.686 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X165.302 Y175.690 E0.0003 F2376

G1 X165.298 Y175.686

**E-1.0000 F3**

G1 Z1.350 F180

G1 X167.298 Y175.352 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X167.302 Y175.356 E0.0003 F2376

G1 X167.298 Y175.352

**E-1.0000 F3**

G1 Z1.350 F180

G1 X169.298 Y175.797 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X169.302 Y175.801 E0.0003 F2376

G1 X169.298 Y175.797

**E-1.0000 F3**

G1 Z1.350 F180

G1 X171.298 Y175.463 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X171.302 Y175.467 E0.0003 F2376

G1 X171.298 Y175.463

**E-1.0000 F3**

G1 Z1.350 F180

G1 X175.298 Y175.574 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X175.302 Y175.578 E0.0003 F2376

G1 X175.298 Y175.574

**E-1.0000 F3**

G1 Z1.350 F180

G1 X179.298 Y175.685 F10800

G1 Z1.250 F180

G1 E1.0000 F600

G1 X179.302 Y175.689 E0.0003 F2376

G1 X179.298 Y175.685

**E-1.0000 F3**

G1 Z1.350 F180

; solid layer