300.0 mm of filament used in this print

Sorry if this is answered elsewhere - can someone tell me how to activate / calibrate the calculation of how much filament is used in a print? I am using SFACT / Pronterface. Whenever I load an STL, the skeining process always finishes with a block of text something like:


300.0 mm of filament used in this print

the print goes from 24.246 mm to 151.254 mm in X
and is 127.008 mm wide

the print goes from 55.719 mm to 111.681 mm in Y
and is 55.962 mm wide

the print goes from -200.0 mm to 26.1 mm in Z
and is 226.1 mm high


The dimensions all seem reasonable; but the problem is - ALL of my prints are calculated to use 300.0 mm of filament!

---

Follow my Mendel Prusa build here: [julianh72.blogspot.com]

julianh72 Wrote:
-------------------------------------------------------
> the print goes from -200.0 mm to 26.1 mm in Z
> and is 226.1 mm high

Erm, i believe your Z axis should not be going into the minus.
A minus means it's going to put your extruder head THROUGH your print bed... It looks like the model is not centred...

As for the statistics on usage etc, I ignore them myself because I've never got them to calculate correctly under repg...

comwarrior Wrote:
-------------------------------------------------------
> julianh72 Wrote:
> --------------------------------------------------
> -----
> > the print goes from -200.0 mm to 26.1 mm in Z
> > and is 226.1 mm high
>
> Erm, i believe your Z axis should not be going
> into the minus.
> A minus means it's going to put your extruder head
> THROUGH your print bed... It looks like the model
> is not centred...
>
> As for the statistics on usage etc, I ignore them
> myself because I've never got them to calculate
> correctly under repg...


Yeah, I noticed that as well. Since I don't know where the code is generated, I can't fix it!

But the prints are fine. It always reports my prints as starting at -200.0 mm, but it actually starts at 0.0 mm (as expected), and the print is actually 26.1 mm high, not 226.1 mm.

---

Follow my Mendel Prusa build here: [julianh72.blogspot.com]

Perhaps you have some kind of homing code that is moving your z axis -200 units to find the min endstop? (I'm guessing in start.gcode?)

I usually ignore what Pronterface says since I got used to looking at the Skeinforge output in the console. But not that you mention it, the info from Proterface doesn't agree with Skeinforge. It's wrong.