Wednesday, April 04, 2007
Several things did, but none that were really troubling. First off, I got the thickness of my layer just a bit too big. For the first 5 layers or so there was no real problems, but by the 6th layer the additive errors got to the point where the extrusion thread began to dribble onto the previous layer instead of being laid down properly. You can see that at the upper right of the foreground perimeter. I should be able to diminish the layer depth and get that problem to go away.
I also observed warping at the corners of the perimeter. I'd seen that before and Vik has reported the same with polycapralactone. I'm wondering if that can be cured by cutting back on the extruder flow as I approach the corners.
Finally, I finally began to get some backlash problems with the y-axis after a while. You can see that happening on the left and right perimeter margins. I noted this before and will attempt to cure that by shimming the sliding joint on the y-axis.
From looking at Stratasys prints you get voids within a printed object if your deposition rate is off slightly. I think that that is why FDM printers go to a lot of trouble to print perimeters.
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