The problem seems to be a mixture of Temperature and Speed. I can’t really go above 50mm/s to be reliable in priting and i have to go as high as 275°C with the E3D V6 hotend with the 0.40 first gen steel nozzle. I can go a bit higher with speed though but then the beginning of infill layers (not solid, only the intermittant infill) doesn’t get printed well and the nozzle slowly collects a bit of stuff. It’s not that problematic but I better avoid it. Also if i lower the temperature or slowly raise speed the infill lines start to break.
Here’s some more key settings using Slic3r (didn’t get any good results in S3D so far):
Filament width: 1,80 (using my caliper i get between 1,77 and 1,80 when measuring)
Extrusion width: 1
Layer height: 0,20
First layer: 0.30
Extrusion width general: 0.48
External perimeter extrusion width: 0.40
infill extrusion width: 0.48 (experimeted a lot with this in the process but found out keeping it at the “standard” 120% of the nozzle works well)
Printing speed 50mm/s for Perimeters, Infill. Solid infill, 40mm/s for external perimeters, top solid infill and support, 250mm/s travel. 30mm/s first layer.
2 Perimeters, 25% infill - both of which should vary depending on the object of course.
Motivated by all that good results i started a big plate of printer parts (the full Eusthatios size) and instantly failed twice. Looks like on more complex parts there’s still some reason the nozzle collects debris and then fails again for the same reasons than before (dropping bigger parts and loosing steps when hitting them).
From what i saw on first sight one possible issue may be that due to the high temperature the material is too solvent to stay in the nozzle for longer travels. I may try longer retracts there. What i saw is that it drops out a bit on travel and gets wiped to the nozzle as soon as it reaches its destination after retract. When printing starts again there’s no extraction for the first few mm and when extraction starts it tends to not stick correctly as it starts “thin”. All of this seems to get better with faster travel and slower printing.
I might experiment with more retraction (only had 3-5 mm tested so far which all worked great as there’s nearly no stringing with CF20) and see if this also makes it possible to print bigger plates with more parts.
@Helmi I don’t use retraction. Somewhere in the slicer I use ( simplify3D ) I set it to stop extruding a little bit before a travel move. Furthermore I have a extrusion width factor of 0,5. These settings work very well for me. This kind of filament swells up quite a bit when printing, so hence the strange settings to compensate.
@Rien_Stouten can you give me some more details about your settings or your factory file? I’m testing without retraction but can’t seem to reach an acceptable quality.
This is a followup to this posting https://plus.google.com/u/0/+FrankHelmschrott/posts/TDWsxUn2cAp and especially @Alex_Skoruppa may be interested in the results.
