[Rozwiązany] Small and Numerous Defects in Mini+ Prints  

RE: Small and Numerous Defects in Mini+ Prints

I looked into it and I found out that humidity is the culprit.

RE: Small and Numerous Defects in Mini+ Prints

You should think about building or buying a filament dryer if humidity is the culprit.  I bought a cheap fruit dryer, printed some extension panels and use it when humidity gets to the filament.  I found the plans on thingverse.  Buying an airtight bin and some silica gel packs helps too.

RE: Small and Numerous Defects in Mini+ Prints

Drying filament always helps. Here are all the tricks I know:

https://sites.google.com/view/newbieprusaminireview/home

There is a link to the filament dryer I made 1/3 way down the page and the stl for a 1/3 size printable segment for the dryer at the bottom of the page. The original design was either full size, which does not fit on the mini, or 1/6 pieces, which don't hold together nearly as well as 1/3 pieces.

Regards,

Mark

RE: Small and Numerous Defects in Mini+ Prints

@mark-6

Thanks ran into your article a while a go, very helpful!  That is the same dryer I built - it does the job.  Living in the rain forest of Oregon it is a must have.

RE: Small and Numerous Defects in Mini+ Prints

@mark-6

BTW - In your article you mentioned not finding any silicone socks that work well on the stock hotend, I've had the same experience until recently.  The one below fits snugly.  Downsides are it is expensive and it doesn't cover the nozzle.  It does keep the rest of the assembly clean in the event of 'crazy' printing.

Mini Heat Block Silicone Sock 

RE: Small and Numerous Defects in Mini+ Prints

Posted by: @daryl-2

@mark-6

BTW - In your article you mentioned not finding any silicone socks that work well on the stock hotend, I've had the same experience until recently.  The one below fits snugly.  Downsides are it is expensive and it doesn't cover the nozzle.  It does keep the rest of the assembly clean in the event of 'crazy' printing.

Mini Heat Block Silicone Sock 

Thanks for pointing that out. I've been waiting for one to be available. I actually had my smoke detector go off and shut down the print when a "spaghetti monster" started covering the nozzle with filament and making fumes. It stopped without making a huge mess.

Regards,

Mark

RE: Small and Numerous Defects in Mini+ Prints

I found these IP67, waterproof, dustproof plastic cases at Home Depot (USA) for $19.98 each, much less than Amazon.  They have done a good job over the last 6 months keeping filament dry (along with desiccant inside bags).

RE: Small and Numerous Defects in Mini+ Prints

@mark-6

Yikes.  Usually starts with a small blob and then rips the whole print off of the bed and goes downhill from there.  I bought the parts for your fire alarm shutoff circuit.  I'm going to tie it in to some other software I run to send me a text if it goes off.  Never around when these things happen, right?

RE: Small and Numerous Defects in Mini+ Prints

Posted by: @daryl-2

@mark-6

Yikes.  Usually starts with a small blob and then rips the whole print off of the bed and goes downhill from there.  I bought the parts for your fire alarm shutoff circuit.  I'm going to tie it in to some other software I run to send me a text if it goes off.  Never around when these things happen, right?

PTFE tube wore out, so it clogged the hot end. I'm working on it. I'll need more spares.

Regards,

Mark

RE: Small and Numerous Defects in Mini+ Prints

To the OP,

Humidity can certainly cause the defects shown, however, it might not always be the culprit. In my case, drying the filament in a food dehydrator made no difference at all. The problem ended up being too much retraction, which was pulling air into the nozzle that would soon be expelled in the middle of a layer. I reduced my retraction value from the default (3.2 mm) to 2 mm and my prints have been flawless ever since (surprisingly there was no major increase of stringing). If reducing the humidity doesn't fix your problem, I hope this helps.

All the Best