Underextrusion at the beginning of infill March 01, 2016 09:59AM |
Registered: 8 years ago Posts: 6 |
Re: Underextrusion at the beginning of infill March 01, 2016 10:22AM |
Registered: 10 years ago Posts: 550 |
Re: Underextrusion at the beginning of infill March 01, 2016 10:41AM |
Registered: 12 years ago Posts: 560 |
Re: Underextrusion at the beginning of infill March 01, 2016 12:32PM |
Registered: 8 years ago Posts: 6 |
Quote
Frans@France
Are these foto's from a top layer or the first bottom layer?
Quote
Frans@France
Is the under extrusion always at the same position for each object (right top corner)? or does it depends on the direction of the extrusion. Reason for asking is that it almost looks like the bed is lower at one end and therefor there is more distance between bed and hotend on that side of the bed
Thanks, I'll try that. 0.68 is the default Slic3r uses when you don't touch the settings and use automatic width. From [forums.reprap.org] I understand that it may be actually desirable to use larger width in some situations, since the filament extruded into free air is actually thicker than the nozzle itself. If you want to print the same width as the nozzle, you must stretch it a little bit, but then there is more tension in the just-laid filament, it contracts and curls up. For infill that is not an issue, but I assume Slic3r uses the thicker line to make sure the "squished plastic" more easily fills all holes. And also to speed-up printing: the default for internal infill is even larger, 1.28 mm. So I think it is not necessarily a bad thing to use widths that do not match the nozzle..Quote
Dirty Steve
Set all your extrusion widths to 0.4mm, same size as your nozzle,(should even out infill and perimeter) and re-calibrate your extruder steps/mm. How did you come up with 0.68 for a 0.4mm nozzle?
As noted in the first post, this is set only to better show the issue. Normally I would use about 0.94. Which is certainly a bit on the low side, but it's exactly where I noticed the problem: I followed Triffid Hunter's calibration guide and I couldn't finish the part where you observe the top solid infill and note when the gaps disappear -- by the time they disappear, the other corner is already overfilled.Quote
Dirty Steve
Ideal setup would have an extrusion multiplier of 1, being at .75 and .8 shows something being off in your configuration.
Re: Underextrusion at the beginning of infill March 01, 2016 01:46PM |
Registered: 12 years ago Posts: 560 |
Re: Underextrusion at the beginning of infill March 01, 2016 06:25PM |
Registered: 8 years ago Posts: 6 |
Good point. It is for the internal infill, which it is not that critical, but it is certainly beyond the reasonable limit of my nozzle: I just measured diameter of the flat area around the nozzle opening and it is around 0.8 to 0.9 mm. So if the width is larger than that, there is nothing that would hold the plastic down, i.e. there is no "squishing action" taking place. And without the squish, there is no way the plastic will just expand to the desired width on its own. True. Good to keep in mind..Quote
Dirty Steve
...
You can't get an extrusion width of 1.28mm from a 0.4 mm nozzle.
Re: Underextrusion at the beginning of infill March 01, 2016 11:12PM |
Registered: 11 years ago Posts: 1,171 |
Re: Underextrusion at the beginning of infill March 02, 2016 06:36AM |
Registered: 8 years ago Posts: 6 |
It is the TOP layer. I noted it both in the first post, and in my first reply.Quote
tmorris9
If that photo is of the bottom layer, then your bed is NOT level. Extruding more plastic is a sudo fix but the correct fix is to properly level your bed.
Re: Underextrusion at the beginning of infill March 05, 2016 02:02PM |
Registered: 9 years ago Posts: 3,525 |
Re: Underextrusion at the beginning of infill March 07, 2016 10:45AM |
Registered: 9 years ago Posts: 183 |
Re: Underextrusion at the beginning of infill March 12, 2016 12:59PM |
Registered: 8 years ago Posts: 6 |
Quote
Montiey
The solid infill / solid top infill / top infill extrusion widths may be too low. If the rest of this part looks fine, these may need to be tweaked.
Re: Underextrusion at the beginning of infill March 12, 2016 02:11PM |
Registered: 9 years ago Posts: 1,873 |