Skeinforge drops extruder into part

Hi all,

I'm currently working through calibration of my reprap mendel and slowly learning all about skeinforge.

I have hit a bit of an odd issue that I'm hoping somebody might be able to help me with. On some of the models I am using Skeinforge is creating the gcode perfectly except for the very last move - for some reason it is keeping X and Y where they are but dropping the Z axis about 1.5mm which digs the nozzle into the part. I find this very odd and do not see any logical reason for it. In order to overcome this I have added and end.gcode to raise the extruder and move it to the purge location, this prevents it just sitting there in the part ruining it.

Does anybody know why this would happen? I am using thingiverse.com/thing:1637 at the moment, but it has happened with a number of other models. Below are the final few lines of the gcode:

G1 X84.24 Y10.2 Z9.73 F420.0 E0.002
G1 X84.31 Y10.14 Z9.73 F630.0 E0.001
G1 X84.39 Y10.09 Z9.73 F420.0 E0.002
G1 X84.39 Y10.09 Z8.15 F630.0 E0.017           <----------- This is where it drops the nozzle
G1 F780.0
G1 E-3.5
G1 F630.0
M103
G1 F780.0
G1 E-3.5
G1 F630.0
M103
;Beginning of end.gcode
G91
M108 S10.0
G1 Z5.0 E-5.0
G90
G1 X70.0 Y-55.0
M104 S24 T0
;M113 S0.0

Any help is appreciated - at the moment I have to check and manually remove it for every print - a bit of a pain!

Cheers

Andy

Is it actually dropping can you see that happen? Or is it that the fill is too much which was my initial problem

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Experimenting in 3D in New Zealand

Which version of Skeinforge are you running and which plug-ins do you have enabled?

JB

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Check out my blog: AdventuresIn3-DPrinting

@ NelsonRap - Yes it is definately dropping the extruder into the piece. It results in either picking up the piece (if it is light enough, e.g. the thin walled calibration piece) and dragging it around when the extruder moves away, or pulling a thread of plastic out as it moves away slightly deforming the piece.

@ JimBlag - I am using Skeinforge 40 (the settings page says Version 11.02.23). The plugins I am using are as follows:

Bottom
Carve
Clip
Comb
Dimension
Export
Fill
Fillet
Jitter
Skirt
Speed/Flow Rate
Temperature

If you need me to expand on my settings at all please let me know.

Thanks

Andy

In a case of dumb luck I have figured out that the Fillet plugin was causing this behaviour. Having deactivated it the extruder no longer drops into the part.

I have not investigated why and the fillet appears to make no significant difference to my prints so I am just going to leave it as is for the time being. If anyone else has any ideas as to why this would happen perhaps you can post so others with the same issue may be able to overcome it (rather than my 'ignore it and it goes away' method).