Jump to content
Ultimaker Community of 3D Printing Experts

Reducing Stringing with TPU95

Recommended Posts

I've recently started printing a set of stoppers out of Ultimaker's TPU95 material. This material is great and extremely shock absorbent, but it tends to string more than other filaments due to its flexibility. This becomes a slight issue when printing two of these stoppers in the same build tray, since when it goes from one tower to another it will string and leave a small blob of material on the surface of the part. In other materials these blots can be easily taken off, but with TPU it becomes harder since the material tends to elastically stick together. Has anyone found any particularly good retraction settings to reduce stringing in TPU?


Here's a picture to illustrate the blotting I'm talking about, seen on the front surface of the square tower:



Share this post

Link to post
Share on other sites

That is certainly a possible approach - the problem is that this Ultimaker is being set up to be used in production, which means it would be expected to make trays of parts at a time to reduce change-over/excess handling. If it were just for engineering though I agree, printing one at a time would work fine.

Share this post

Link to post
Share on other sites

Based on personal experience, I would strongly advise against the printing of trays of parts for one simple reason: if something goes wrong and a print fails, it's better to loose one part and one hour of printing, plus the material used for that part, than 10 parts and ten hours of printing, plus the material used for said parts.


As for change over and excessive handling, you just need to buy a second glass bed: when the first print is done, you remove the glass bed, put in the second one and start the print of the second part, which takes about one minute or two. Then you can get the first print of the first glass bed, clean the glass and you're ready for the third print.

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

  • Our picks

    • Ultimaker Cura | a new interface
      We're not only trying to always make Ultimaker Cura better with the usual new features and improvements we build, but we're also trying to make it more pleasant to operate. The interface was the focus for the upcoming release, from which we would already like to present you the first glance. 
        • Like
      • 114 replies
    • "Back To The Future" using Generative Design & Investment Casting
      Designing for light-weight parts is becoming more important, and I’m a firm believer in the need to produce lighter weight, less over-engineered parts for the future. This is for sustainability reasons because we need to be using less raw materials and, in things like transportation, it impacts the energy usage of the product during it’s service life.
        • Like
      • 12 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!