Batman holes / craters on the top layer  

RE: Batman holes / craters on the top layer

@3delight

You might be right. 

Can it be caused by a displaced fan-shroud? 

RE: Batman holes / craters on the top layer

Ran a factory reset, calibrated everything again, same issue.

Z is at -.995, which is what I need to do to get the First Layer Calibration Wizard to come out right. Think that might be it?

RE: Batman holes / craters on the top layer

Posted by: @antonio-da-catania

@3delight

You might be right. 

Can it be caused by a displaced fan-shroud? 

It's possible if it affects the cooling of the part.

RE: Batman holes / craters on the top layer

Posted by: @dark_nes

Ran a factory reset, calibrated everything again, same issue.

Z is at -.995, which is what I need to do to get the First Layer Calibration Wizard to come out right. Think that might be it?

Try raising the nozzle a couple of steps and see if that helps, it might be a case of getting striking a balance between the perfect first layer and the perfect top layer.

If that doesn't help then it must be something to do with the part cooling, it may be adequate to print the rest of the model but not the final top layer.

Have you tried printing other models to see if you get the same problem?  It would need to be something with a flat top and infill. throughout.

RE: Batman holes / craters on the top layer

@3delight

Yeah, I'm now seeing this problem with a pillowing top first layer on a few other models that used print without issue.

RE: Batman holes / craters on the top layer

No luck with raising the nozzle a few steps, either.

RE: Batman holes / craters on the top layer

It really does sound like it all comes down to poor cooling control, which is odd.  When you print and it's on the last layer have you visually  checked that both fans are going and constant?

RE: Batman holes / craters on the top layer

@3delight

Hey,

So I monitored the entire print and both fans were going strong the whole time.

Oh my, this is maddening.

RE: Batman holes / craters on the top layer

@dark_nes

Hi, can you please take a picture of the nozzle/fan-shroud from below and from the side? 

Be our eyes 😅

This case is getting puzzling! 

RE: Batman holes / craters on the top layer

@antonio-da-catania

Starting to think this may be an under extrusion issue and bought the lube described in the "Clean Bondtech" section of this page, so that Amazon order should show up Monday.

RE: Batman holes / craters on the top layer

@dark_nes

Dude. The left fan is mounted on the wrong side. 😅 The sticker must be facing to the right (towards the extruder).

As concern the front fan, i assume it is mounted that way only during the maintenance. 

RE: Batman holes / craters on the top layer

Whoa, okay. I mean, that’s how it showed up when I ordered it, but I can try turning it around.

I don’t follow what you might mean about the front fan, though.

RE: Batman holes / craters on the top layer

@dark_nes

Wait. Did you bought the printer brand new and already assembled from the original eshop (i mean, no second hand, no third party store)?

by the way, you can check how the hotend fan is supposed to be mounted here (steps 25-26).

After that, scroll down and give it a look to the step 40 to see how to mount the front fan.

RE: Batman holes / craters on the top layer

@antonio-da-catania

Yes, this is an Mk3 bought directly from Prusa.

RE: Batman holes / craters on the top layer

I suggest you look closely to the fan blade and compare. One edge is facing out; the other in. Also, check rotation direction.

Is it possible some batches of fans are built differently with stickers on the opposite side????

Just a good way to make sure it's is or is not mounted correctly.

But, the front fan looks like it's not in the housing, but maybe you just moved it for the picture?

Ted

RE: Batman holes / craters on the top layer

Is it possible some batches of fans are built differently with stickers on the opposite side????

Short answer - no
Full answer - it would be the first time for me to see such a thing 😜 

@dark_nes please, follow my previous post and let us know how it goes after that.

RE: Batman holes / craters on the top layer

@technical-ted

Looking at where the dust is deposited, I would say the fan is blowing the air out (towards the sticker) so it is mounted the wrong way.

RE: Batman holes / craters on the top layer

@antonio-da-catania

Well, I turned the left fan around so the sticker's facing in, but the print still came out exactly the same (bad).

In the 2nd picture above, I have the extruder inhaler door open just to show there's no debris in there. Is that what you're referring to regarding the front fan?

RE: Batman holes / craters on the top layer

@antonio-da-catania

Wait, nevermind, I see what you mean now re: front fan. I am smrt.

RE: Batman holes / craters on the top layer