SoliForum - 3D Printing Community — Are these evaporation bubbles?

Re: Are these evaporation bubbles?

2013-08-01T08:28:46Z

I was having problems like that with my printrbot using RH and slic3r and it was fixed after a good soak in acetone for my nozzle. Maybe you have a partially clogged nozzle? It's worth a shot...

Re: Are these evaporation bubbles?

2013-07-29T16:50:31Z

I have never been able to get the ID of holes to line up correctly. This is mostly due to slic3r from what I have been reading. OD is perfect, thickness is perfect, but ID of round circles always will be off.

I have been compensating by just over sizing all my holes by 0.5mm. I think that other slicers are not having this problem to the same extent, although a lot of it is just part of the way the deposition works... the inside perimeter of the hole is always printed in a single loop. As the loop cools, it contracts and the hole is a little smaller than it was printed.

Re: Are these evaporation bubbles?

2013-07-28T19:43:28Z

I think SolidoodleSupport identified the issue, at least in part. I checked the extruder multiplier and it was set to .78. I changed this to 1 and printed a single wall print and it came out great. I went back to the nickle calibration print and it no longer fits. My result was ~20.46 ID where I should have 21.21. OD is still about right(~38.15). I came back down to .90 multiplier and didn't have much luck..fix one thing break another. Is there another setting I can change that would correct the ID while leaving single walled prints accurate?

I switched back to Octave black for a couple test prints to see if it was a factor. Once I realized the extrusion multiplier was in fact the issue i switched back to Octave red. First image below is .78, then 1, then 90.

Current Settings in Repetier & Slic3r
Steps per mm: X:87.18 Y:87.13 Z:2268.00 E:97.44
Filament: Diameter 1.69 Extrusion multiplier: .9
Nozzle Diameter: .4

Hotend: E3D with .4mm nozzle

edit: What appears to be holes in the second image (1 multiplier) is just the bottom of the opposite wall.

Re: Are these evaporation bubbles?

2013-07-26T23:36:23Z

Yea, I cleaned it well with some can air when I tightened the wheel. No dust in there right now

Re: Are these evaporation bubbles?

2013-07-26T23:26:04Z

Is your extruder gear grip thing clean? I had this issue when it wasn't after I stripped a filament.

Re: Are these evaporation bubbles?

2013-07-26T23:24:29Z

I re-calibrated my feedrate and all steps for the 'nickle calibration'. Below is a second and third attempt at the vase as well as some rafting I printed at 10% speed. I've never used rafting before so not sure how to get it like Ian displayed above. When watching the rafting print it's clear the extruder is just not pushing out ABS during those gaps. Whether or not it is pushing out gas or some other issue I do not know...Also, the extrusion wheel is set very tight after I had some issues with the wheel stripping plastic week or two ago.

Raft

Re: Are these evaporation bubbles?

2013-07-26T16:12:45Z

I agree with others, this doesn't look like a water issue. usually when i extruded filament that has been open for a long time, the bubbles i got will raise a little and contracts again when it cools, just before abs hardens... so there is a not so visible bump... but never a gap.
I know the wall is thin, however, from your gcode, is there any retraction? or tighten extruder screw and make sure filament feed is not skipping.

Re: Are these evaporation bubbles?

2013-07-25T16:47:55Z

If you still want to do single perimeter, try increasing the extrusion width a little. That will give them a little more overlap to support the angled walls. It could be the gaps are caused by perimeters that are misaligned just enough to not supoprt the layer above.

Re: Are these evaporation bubbles?

2013-07-25T14:57:10Z

I'd say try increasing the number of perimeters. The thin walls may show the extrusion multiplier is a little low. Try also increasing the flow rate by 10%.

It looks cool, though, but it won't hold water, will it.

Re: Are these evaporation bubbles?

2013-07-25T13:40:50Z

Krythis wrote:

Having a hard time finding images of bubbles caused by humid ABS filament. Is that what I am seeing here?

Scripted Ribbon Vase (thing:104694) scaled to 3"
.2mm layer height with 'Spiral Vase' option selected
2 perimeters
E3D hotend at 245ºC

http://i.imgur.com/4iJ7eg2.jpg

http://i.imgur.com/P9d2Jsd.jpg

Extrusion multiplier?

Re: Are these evaporation bubbles?

2013-07-25T05:50:00Z

MolecularConcept wrote:

Where is the option to print a raft its not in slicer othat I can see just skirt and brim options.... sorry for the off topic question

Newer version of Slic3r has it as an option. But I'm thinking that one Ian showed is actually an older skeinforge raft..

Re: Are these evaporation bubbles?

2013-07-25T05:44:10Z

Where is the option to print a raft its not in slicer othat I can see just skirt and brim options.... sorry for the off topic question

Re: Are these evaporation bubbles?

2013-07-25T05:43:55Z

ITman496 wrote:

I don't know much about 3D printing, since I'm new to it, but isn't 245c a bit hot for the extruder?

A standard solidoodle hotend with PEEK, yes.. but not an E3D all-metal which the OP has.

Re: Are these evaporation bubbles?

2013-07-25T05:21:29Z

It's hard to say with a single perimeter wall because the slightest error will cause problems for several layers above since there is nothing to extrude onto. I'm not sure a bubble would cause that much of a gap. Bubbles would be easiest to see in a raft printed slow with wide threads like this one -

Re: Are these evaporation bubbles?

2013-07-25T05:17:25Z

I would think the bubbles from evaporating water would be much smaller than those, I could be wrong though.