Minor error on Marvin

Uranday · 2016-09-05T04:17:17.000Z

I have a nozzle fan on all the time. For my last print I added a desk fan on the table full on. No difference. Tonight ill try slowing the print down and see what that does.

Uranday · 2016-09-05T04:18:56.000Z

I dont mind. Lets find what is nagging us. Have now 6 single browed Marvins staring at me

Uranday · 2016-09-05T04:19:58.000Z

For mine also, inside first.

Uranday · 2016-09-05T04:24:28.000Z

Its better when adding the deskfan. (see pic). My next step is printing at a lower speed.

20160905_062123.jpg2268×4032 2.29 MB

Perry_1 · 2016-09-05T13:36:23.000Z

OK, this is a “sagging” issue. The filament is falling, as there is nothing beneath it to support it. This is a result of a combination of cooling issues and overextrusion, creating too much material that has no support under it.

For PLA, you need to have active cooling.

You can also increase the cooling setting on your slicer software. That is, increase the pause between each layer, so each layer has more time to cool before the next layer is printed. This allows the print to have better support on it.

Also, print 4 marvins at the same time, or add it to another print you are doing. More printing time per layer = less sag.

Finally, it appears you are slightly over extruding. Measure your filament, make sure it is the set correctly. Extrude slightly less filament.

wirlybird · 2016-09-05T14:11:27.000Z

Ok, so I have the cooling running at full after layer 1.

I have run one at 500mm/min and can watch it sag as soon as it is laid down.

I am going to try 10 degrees lower on the extruder and see what happens.

I need to figure out the bridging area of S3D to see if I can get that setting to help on reducing the extrusion during that area.

Perry_1 · 2016-09-06T13:05:48.000Z

ok, so this is mostly NOT a bridging issue. There is not much bridging going on there.

The bridge is when plastic is stretched from one area to another. In this case, this is a print area where a section is printed, and the extruder turns. Next layer, the section is printed further, and the extruder turns.

Fiddling with bridging is fine, and may help some.

Here is another suggestion: Support material. Click the support icon, choose .1mm, then automatically generate support. (you may have to add some manual supports. In your support settings, choose .2mm offset. this will create a wisp of support in that area, that will easily come off.

But again, this is a cooling issue. Print several at a time.

3drapidprints · 2016-09-06T13:41:14.000Z

Try turning the bed heat off and set the extruder temp to 180. Also, make sure the fan is at 100% while printing.

wirlybird · 2016-09-06T13:54:35.000Z

Thanks for the info. I didn’t think it was really bridging but still learning!

I did print 2 at a time but go the same basic result. I have it pretty good for no support (thinking no support was a requirement for test). I have cooling maxed out and print as low as 500mm/min but back up to 1000mm/min seems to get the same result so sped up for time sake!

I’ll give your support suggestions a try to learn and see how it goes.

wirlybird · 2016-09-06T13:55:20.000Z

I think we are gaining on this sucker!

wirlybird · 2016-09-06T13:56:00.000Z

I’ll give it a shot. Thanks.

wirlybird · 2016-09-06T13:57:13.000Z

Is there a better/recommended fan set up for the Flashforge Creator Pro 2016? It does have the fan for the left extruder.

wirlybird · 2016-09-06T13:59:07.000Z

I have a couple teams now! In different colors. Running two machines on this one!!

Uranday · 2016-09-06T14:07:25.000Z

Thanks for your suggestion. I tried printing at a much lower speed and that didnt gave any result. First I go calibrate my printer and if that does not work I print 4 of them in 1 go to see what that gives. Let you know when its done.

Uranday · 2016-09-07T11:10:12.000Z

For now I did the following things to make it better:

- Lower the temp 5 degrees (no result)

- Increased the retraction with .5 MM

- Next to my nozzle fan I added a desktop fan to bring more cooling (cleaner model, but still a brow on the left eye)

- Calibrated my layer width (no result)

- Slowed the printer from 3600 to 2800 (no result)

For now I am going to print 4 of them in 1 print and see if that makes it better. Though, I cannot imagine that it should be that you have to print more models to get a clean one… Somewhere, something is going wrong, but I have no clue what… I hope that anyone has some extra tips and tricks.

3drapidprints · 2016-09-07T12:25:55.000Z

Did you try turning off the bed heat and setting the extruder heat to 180?

Perry_1 · 2016-09-07T13:04:04.000Z

The reason many folks on this board have suggested multiple marvin prints at the same time is that effectively slows down the time between each layer, allowing the previous layer to cool and fully crystalize before the next layer is printed.

This is why I suggested you print it along with another item you are printing, or to print several of them.

It is a tried a true solution that has solved marvin issues in the past, and is a common solution when printing small parts. Inactive cooling.

Uranday · 2016-09-07T14:08:30.000Z

Will try that after my current test is done. Though it is frustrating, I like the getting better prints part of it

Uranday · 2016-09-07T14:53:26.000Z

With 4 of them there was still a small brow… Next print is 180 with no bed heath.

wirlybird · 2016-09-07T17:06:57.000Z

I have tried 180 but not with the bed off. 180 for the PLA I am using is lower than it likes. The loop at the top will crumble if touched, like it crystalized. It doesn’t react this way when printed at a higher temp.