Jump to content
Ultimaker Community of 3D Printing Experts
nerdwarrior

Extreme under extrusion

Recommended Posts

Hello,

I was printing my first print (a marvin), and my initial layers turned out horrid, like spider webs!

WIN_20160620_200625.thumb.JPG.725e65b41cab55489e1643926e443ad1.JPG

This was one of the nastier ones, but my first marvin had it as well, but it did go away once it reached the top. Does this have to do with the puddle of molten pla I found on top of my heater block? I'm currently using a UMO+

If you've got any tips, please reply!

So far, the one solution I've thought of is giving each print a nice, big brim so that it uses up all that horrible printing on that, and once my print starts, it is fine.

WIN_20160620_200625.thumb.JPG.725e65b41cab55489e1643926e443ad1.JPG

Share this post


Link to post
Share on other sites

It sounds like you have an issue with the heater block. It should not have any plastic on the top of it.

This means there is a leak somewhere or something is not aligned or installed correctly. Have you tried doing an atomic pull to make sure the nozzle is not blocked? If you do this you may see where the issue is.

Share this post


Link to post
Share on other sites

Hello Labern,

Sorry, I didn't see your reply before I sent that comment just now

I'll try an atomic pull, but I've noticed that the leaking has stopped.

I think it's just that the filament doesn't extrude. It keeps grinding the filament, and when it doesn't, it still doesn't come out smoothly. I thought that maybe it was too far away from the bed, but I ended up going so close the nozzle scratched the glass.

I've put some oil on the feeder, and stuck a small kleenex wet with oil onto the bottom so the filament going into the feeder gets lubricated.

It just seems so unpredictable!

How should I fix the feeder?

Share this post


Link to post
Share on other sites

Like I got one amazing/perfect print, but it stopped extruding halfway thru:

WIN_20160621_180753.thumb.JPG.f798a1ccadee2aa16c844b805d2106ce.JPG

(sorry about the horrible quality. My SD card slot is broken so I'm stuck with my computer camera)

Now, it seems like the filament is going up the tube (it seems like it, but i could be wrong).

When I turn it by hand, I can usually get nice, beautiful, even strings, but they never show up in my prints!

WIN_20160621_180753.thumb.JPG.f798a1ccadee2aa16c844b805d2106ce.JPG

Share this post


Link to post
Share on other sites

You don't want to lubricate the filament going into the feeder. That may just cause more issues and my introduce slipping. If the feeder is grinding then it probably means that it's not tight enough pushing onto the filament or really tight. Or there is a problem in the hotend so the filament can't push through.

Share this post


Link to post
Share on other sites

Oh, okay.

I'll get rid of the oil. Can I put it in the bowden?

I'm printing at 230 and 50 mm/s (I don't remember exactly, but that's about it)

The 230 because I thought it would flow better. 50 to match it.

I don't know if it's the hotend. The odd thing about it is that every time I manually extrude, I get 2 puffs of smoke each accompanied by a sizzling sound before any plastic comes out.

And thank you so much Labern for replying!

Share this post


Link to post
Share on other sites

oooh

and it seems like my filament is stretched out (in the bowden tube).

Do you think it will help if I reassemble the feeder, remove the filament with an atomic pull, then snap off all the stretched out parts?

I can't really tell, because I've only had my printer (assembled) for a few days, and my experience is near zero.

Share this post


Link to post
Share on other sites

You can put oil in the bowden tube but this is normally done with flexible filaments like ninjaflex and you only need 1 drop.

You may need to accompany some of your descriptions with some photos. What is the impression from the knurled feeder wheel into the filament? it should have between 2-3 indentations from the feeder wheel side by side.

You should really remove all bad sections of filament.

What filament are you trying to print with?

The smoke sizzling may be coming from the oil, it can also be from high temps (maybe bad temp sensor) or you may have bad filament.

  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Announcements

  • Our picks

    • Architect Contest | Entourage 01.
      Presenting an idea, an architectural design or something as big as an urban project isn't easy. A scaled models can really help to get your idea across. But besides your main model, there is more needed to get your idea across vividly! An architect regularly uses various entourage sets to help bring these ideas and models to live. 
        • Like
      • 9 replies
    • What The DfAM?
      I'm Steve Cox, an experienced engineer familiar with 3D printing. I wanted to share some DfAM guidelines with this community to help and make stronger parts.
      I'm also an Autodesk Certified Instructor for Fusion 360, so many of the images in ...
        • Thanks
        • Like
      • 17 replies
×

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!