Jump to content
henri

resolution of circular cross section

Recommended Posts

Posted · resolution of circular cross section

After I installed my Olsson block from Fbrc8 (with adventures) my Ultimaker 2 hit a sweet spot and is performing particularly well. I printed a tapered cylindrical pillar using 0.06mm layers and really cannot see the layer lines, so cancelled my idea of a pseudo lathe to rotate it in order to smooth it with sandpaper.

However I noticed that the circular cross section is actually a polygon. Difficult to count, but maybe 40 sides, and this is just visible. Is this a function of Cura, or the drawing software, and can it be improved?

The upgrade. What I learned:

Replacing the Teflon piece was a big factor. Of course I should have known if I had been paying attention.

Do not go out and buy a torque wrench and apply 1+ N-M. It is too much. The Olsson plastic one gives you less than half as much, which is plenty.

Of course you have to print it. Either do that with your old setup, or screw in the new nozzle hand tight, and then tweak really gently with a 10 cm or so long 7mm spanner.

Share this post


Link to post
Share on other sites
Posted · resolution of circular cross section

I suspect you are seeing the sides of the polygon which approximates to the circle. I use Sketchup for design which assumes a 24 sided circle, which you can see the sides. I now set the number of sides to 99 and these are now invisible.

Share this post


Link to post
Share on other sites
Posted · resolution of circular cross section

Don't set the value too high in you cad software - if the line segments are say 5 per mm it will drastically slow down your print because of how Marlin (the firmware) works.

Marlin can only read 12 moves ahead and doesn't know if a sharp turn (e.g. corner of square) is coming up on the 13th move so it has to be ready to stop 12 moves ahead and if all 12 moves are in the next 3mm it needs to print VERY slow. It will cause bad quality.

Share this post


Link to post
Share on other sites
Posted · resolution of circular cross section

Re. the tightening Olssen block preperly, you don't need that silly wrench, just hold the smooth-sided socket in your fingers, and tighten the nozzle moderately using only the socket. If you try to tighten it too much, your fingers will just slip on the socket.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Our picks

    • Ultimaker Cura 4.0 | Stable available!
      Ultimaker Cura 4.0 is mainly focused on the improved user interface and cloud integration.
      As always, we want to collect your user feedback for this release. If there are any improvements you can think of, feel free to mention it here and help us to shape the next release.
      • 96 replies
×
×
  • Create New...

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!