alexrj/Slic3r — Issue #245: _BRIDGE_FAN_END causes huge extruder retraction in version 0.7
Author: Jerry-XYZ
Created: 2012-03-03 17:26:58+00:00
State: open

This comment is in the gcode generated by version 0.7, and wasn't in the prior version. This comment shows up before the second layer of a bridge event.

My RAMPS 1.4 setup, running Marlin (files dated 1/21/12), has a big problem when it hits the line saying, "_BRIDGE_FAN_END". If I comment out that line, the gcode runs fine.

It causes a huge extruder retract, like 10 or 15 mm probably, that makes the extruder not put out any filament until it catches up.

These snippets are from slicing the calibration object 20mm hollow box
(from here: http://www.thingiverse.com/thing:5573)

Here's a snip from slic3r 0.7:
G1 X107.364 Y108.610 E21.35285
G1 X108.074 Y108.610 E21.37550
G1 X108.610 Y108.074 E21.39966
G1 F1500.000 E19.89966
_BRIDGE_FAN_END
G92 E0
G1 Z11.700 F11220.000
M106 S249
G1 X109.032 Y109.032
G1 F1500.000 E1.50000
G1 X90.968 Y109.032 F2400.000 E2.07170
G1 X90.968 Y90.968 E2.64340

And, the same section as sliced by 0.6:
G1 X107.364 Y108.610 E21.35285
G1 X108.074 Y108.610 E21.37550
G1 X108.610 Y108.074 E21.39966
G1 F1500.000 E19.89966
G92 E0
G1 Z11.700 F11220.000
G1 X109.032 Y109.032
G1 F1500.000 E1.50000
G1 X90.968 Y109.032 F1800.000 E2.07170
G1 X90.968 Y90.968 E2.64340