Firstly thanks for the reply, it’s much appreciated
I'd stick to 0.25mm or 0.20mm layer heights until you get a few really good prints done. Thinner is certainly possible but it's easier to work through issues if you start with the easier settings..
Haven’t tried to print again, but will switch to 0.2 when I do
Pretty much all of these pictures look to me like they need more plastic. You should only be able to see the outer-most layer and I can see the layer(s) underneath on most of these pictures.
What's your start.gcode look like? If you're not sure, just post the first ~20 lines of something you sliced recently.
At first I used your start gcode here
http://dl.dropbox.com/u/16630702/start.gcode
).
Are you sure you've measured your filament diameter accurately and told SF45 what it is? It's in the Dimension tab. When you measure the filament, make sure to get a variety of readings from different angles and use the average. Also, the Filament Packing Density setting should also (for now) probably be set to 1.0.
I measured in a few places, got anything between 2.95 and 3.1mm so I decided to go for the lowest value, and see if I got too much plastic from time to time. One could argue that the blobs and strings might be examples of that but as you pointed out, overall, it seems to be lacking plastic. The Filament Packing Density is set to 1.0
Fill\Solid Surface Layers tells SF how many totally-filled layers to do near outside surfaces. People usually forget about changing this when they change layer height.. Usually, for a layer height over 0.25mm or so, this parameter gets set to 3 which means 0.75mm (= 0.25mm * 3) of solidity on outside surfaces. If you keep this at 3 but change layer height to 0.10mm you're only now getting 0.30mm (= 0.10mm * 3) of solidity, which probably isn't going to give you a clean outside surface, if you're trying to cover up a less-than-solid infill. There's no hard rule for how to set this but I'd move up to 5 if you're at or under 0.10mm layer heights. This is one of those things that just takes practice: keep an eye on it when you see it starting to cover up sparce infill - the first layer or so looking crappy is normal but the outside surface should be nice.
Thanks for the explanation, I hadn’t altered that but I will certainly do so for the next print.
You didn't mention Carve\Perimeter Width Over Thickness and Fill\Infill Width Over Thickness.. The w/t values control how skeinforge slices things on the horizontal. This value times the layer height is the width of the threads in the print. With a 0.40mm nozzle, you probably want threads in the 0.40mm to 0.6mm range, though you can probably get away with as low as (despite common sense) 0.35mm or as high as 0.75mm or so. As you change layer height, make sure to also set these values. At 0.10mm layers, w/t values of 5 will get you 0.50mm thread widths, which is a good place to start. For now, just divide 0.50 by the layer height and set the two w/t values to the result..
Yeah sorry about that, I had them both set to 4 for all prints(besides the calibration cube which the repg26 SF35 high quality profile handled), so a thread width of 0.40mm for all. I’ll up it to 5 as you suggest for the next print.
Could be too much belt tension but probably not too little, I think.. The machine tried to push the print head in one direction something pushed back so much that the stepper motor lost some steps. The electronics don't know when this happens and just assume that every move happened as-expected.
With the power off (or steppers disabled), make sure the print head moves smoothly in each direction. If it doesn't, take a close look to make sure stuff's lubed and orthoganal. If you've got blobs on a print, that can also cause skips if the print head smacks into one at high speed..
Sorry, I was a little bit vague in my comment, I wasn’t talking about the layer shift which I also thought was due to the nozzle hitting a blob.
It’s not easy to see in the photos, but earlier when I was talking about infill intersection with the perimeter, it seemed to me that the infill itself was shifted a bit to the left relative to the perimeter of the whistle, but looking at it again it’s not really a shift, it just misses or intersects too much in places. For an example of “excessive intersection”, in this photo
http://dl.dropbox.com/u/16630702/second ... ECTION.jpg
you can see that on the opposite side of this ridge, the infill doesn’t touch the inner perimeter of the whistle indicating that in that area the infill has come too far down.
Do you have any idea why that might be ?
Thanks for the help.
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ddurant 0
I'd stick to 0.25mm or 0.20mm layer heights until you get a few really good prints done. Thinner is certainly possible but it's easier to work through issues if you start with the easier settings..
Good move, going up to SF40+ and Sprinter/Marlin!
Pretty much all of these pictures look to me like they need more plastic. You should only be able to see the outer-most layer and I can see the layer(s) underneath on most of these pictures.
What's your start.gcode look like? If you're not sure, just post the first ~20 lines of something you sliced recently.
Are you sure you've measured your filament diameter accurately and told SF45 what it is? It's in the Dimension tab. When you measure the filament, make sure to get a variety of readings from different angles and use the average. Also, the Filament Packing Density setting should also (for now) probably be set to 1.0.
FillSolid Surface Layers tells SF how many totally-filled layers to do near outside surfaces. People usually forget about changing this when they change layer height.. Usually, for a layer height over 0.25mm or so, this parameter gets set to 3 which means 0.75mm (= 0.25mm * 3) of solidity on outside surfaces. If you keep this at 3 but change layer height to 0.10mm you're only now getting 0.30mm (= 0.10mm * 3) of solidity, which probably isn't going to give you a clean outside surface, if you're trying to cover up a less-than-solid infill. There's no hard rule for how to set this but I'd move up to 5 if you're at or under 0.10mm layer heights. This is one of those things that just takes practice: keep an eye on it when you see it starting to cover up sparce infill - the first layer or so looking crappy is normal but the outside surface should be nice.
You didn't mention CarvePerimeter Width Over Thickness and FillInfill Width Over Thickness.. The w/t values control how skeinforge slices things on the horizontal. This value times the layer height is the width of the threads in the print. With a 0.40mm nozzle, you probably want threads in the 0.40mm to 0.6mm range, though you can probably get away with as low as (despite common sense) 0.35mm or as high as 0.75mm or so. As you change layer height, make sure to also set these values. At 0.10mm layers, w/t values of 5 will get you 0.50mm thread widths, which is a good place to start. For now, just divide 0.50 by the layer height and set the two w/t values to the result..
Could be too much belt tension but probably not too little, I think.. The machine tried to push the print head in one direction something pushed back so much that the stepper motor lost some steps. The electronics don't know when this happens and just assume that every move happened as-expected.
With the power off (or steppers disabled), make sure the print head moves smoothly in each direction. If it doesn't, take a close look to make sure stuff's lubed and orthoganal. If you've got blobs on a print, that can also cause skips if the print head smacks into one at high speed..
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