Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  
chenobble

Newbie print problems - excess plastic, nubs and removing supports

Recommended Posts

Hi folks,

Using Cura 14.0.7 and with the firmware updated as of two days ago.

I feel like most of my issues are basic newbie problems but i can't see an FAQ anywhere so I'll go ahead and ask...

Just got my UM2 working after the temperature sensor broke the day I bought it and my first few prints are finally coming out.

I'm hugely excited by this but there are a few concerns I have, namely:

1. The support framework that Cura makes leaves an obvious grid pattern on the underside of my prints which takes some serious sanding to remove, obviously affecting detail quality of the model.

2. the model, even on flat surfaces, is covered in plastic nubs that also need sanding off.

3. Strings of excess plastic presumably from where the nozzle relocated with melted PLA stuck to it. These are easy to remove but may be indicative of other issues.

4. Removing the print from the glass bed requires a paint scraper and a lot of force despite liberal application of the provided gluestick before printing.

Bear in mind that I've yet to come to grips with the configuration settings (or even how to change them) of my UM2 so you may need to overexplain some things...

 

Share this post


Link to post
Share on other sites

Hey Chenobble

Welcome to the forum. Don't worry we are all noobs around here!

If you can, upload a few images of some of your prints and we will take a look.

Cura`s support structure isn't the best. If you can, try to avoid support as much as possible, by reorientation, splitting the part, etc. Also take a look at mesh mixer.

If you are unpatient ( like me ) then forcing the print off the heated bed is sometimes tough, even with the whack of a hammer! If you leave the printer to cool down a lot, they should just pop off quite easily.

 

Share this post


Link to post
Share on other sites

I have only used Cura's support feature on about 1% of my prints. Like skint says, try other orientations, or just don't worry about it, or use meshmixer:

http://www.extrudable.me/2013/12/28/meshmixer-2-0-best-newcomer-in-a-supporting-role/

 

As far as "nubs" you need to post a picture as there are 30 possible causes and post all your settings (just save settings to file and post that) but in general slower speeds give you better quality. So you can either print it fast and get something useful/functional or print it slow and get something beautiful.

 

Share this post


Link to post
Share on other sites

By the way I often think something will be impossible to print and it just - sort of - works...

Like a human with hands hanging down - the finger tips are printed completely isolated in the air and fall to the bed but somehow the printer eventually recovers and actually manages to print it anyway.

 

Share this post


Link to post
Share on other sites

gr5 - thanks - i'll try meshmixer!

Skint - I tried printing this model:

http://www.thingiverse.com/thing:98361

with some of the settings suggested on this site before I recieved these replies - I slowed the print speed to 40 and upped the quality to high but didn't think to turn off support. It seemed to reduce the nubs a lot but the strings are still there, details are somewhat blurred and I don't know what happened to the spear...

http://imgur.com/a/IdbTx#0

 

Share this post


Link to post
Share on other sites

Wow - that's some serious stringing. Please don't post imgur pics. I don't think they maintain pics for 10 years and someone else might have the same question as you in the future. Please post it here on this forum.

Don't use those low/med/high quality things in Cura. They probably don't do retraction. You need retraction to remove stringing. Also you probably need to print that color of PLA 10C cooler than whatever you were doing.

The numbs might be from the model. It might have excessive polygons. I would reduce the qty of polygons to around 10k maybe (or at least reduce by 10X) by using this procedure - it can make the model come out MUCH better:

Meshlab:

http://www.shapeways.com/tutorials/polygon_reduction_with_meshlab

 

 

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
Sign in to follow this  

×

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!