Jump to content
Sign in to follow this  
Blizz

Bug: "Fit" algorithm ignores Cut off value

Recommended Posts

Posted · Bug: "Fit" algorithm ignores Cut off value

The code that determines whether an object will fit for printing seems to ignore the "cut off bottom" value.

I am trying to print an object that is 210mm high on an UM2, which has 205mm as maximum height. I can cut of whatever I want from the bottom, it still shows as non-printable. It's not exceeding maximum directions in either X or Y.

 

Share this post


Link to post
Share on other sites
Posted · Bug: "Fit" algorithm ignores Cut off value

hi,

I have exactly the same problem. I want to print a large object in 2 pieces (upper half and bottom half) but I can not generate a gcode although it is not too large within the construction space.

Z=320mm-153mm Cut off = 167mm

size

(why is the picture so huge?)

 

Share this post


Link to post
Share on other sites
Posted · Bug: "Fit" algorithm ignores Cut off value

I worked around this by temporarily setting the Z maximum height at a greater value in Machine settings.

 

Share this post


Link to post
Share on other sites
Posted · Bug: "Fit" algorithm ignores Cut off value

Will the machine physically get to 210mm? As in: Is there a safety margin involved?

Or is the extreme limit really 205mm...

I could print the piece at 205, but the full piece would be a lot better obviously :)

 

Share this post


Link to post
Share on other sites
Posted · Bug: "Fit" algorithm ignores Cut off value

Thats the danger of cnc machines and 3d printers. if you give them instructions they will perform them even if they cant. Thats why you need to be vigilant about it. But if you know you cut off 5 mm then you should be fine.

I cheat the granty height all the time when one piece (the last one being printed) is taller than the normal value.

Share this post


Link to post
Share on other sites
Posted · Bug: "Fit" algorithm ignores Cut off value

I regularly cheat the gantry height as well. Will also sometimes set a very low gantry height and reduce the other dimensions yo just for the print head. Then you can print lots of short stuff one at a time.

Share this post


Link to post
Share on other sites
Posted · Bug: "Fit" algorithm ignores Cut off value

This is due tot the fact that the "sink into platform" is applied after everything else. It's pretty much a hack in the code, so most code does not handle this properly.

 

Share this post


Link to post
Share on other sites
Posted · Bug: "Fit" algorithm ignores Cut off value

Anyhow... just printed the piece at full height (210mm) and I had about a cm of Z to spare.

 

Share this post


Link to post
Share on other sites
Posted · Bug: "Fit" algorithm ignores Cut off value

Anyhow... just printed the piece at full height (210mm) and I had about a cm of Z to spare.

 

Makes perfect sense. The early UM2s had a 10mm longer print head then the newer UM2s. And Cura is setup so both version work safely.

So yes, you have 10mm MORE Z space then advertised.

 

Share this post


Link to post
Share on other sites
Posted · Bug: "Fit" algorithm ignores Cut off value

....The early UM2s had a 10mm longer print head then the newer UM2s....

 

how can I tell if I have a new or old model?

 

Share this post


Link to post
Share on other sites
Posted · Bug: "Fit" algorithm ignores Cut off value

dirkdirk... Measure it :) That's what I did to make sure the piece would fit! :)

From the bottom of the nozzle onto the buildplate at its lowest. Just make sure to have some spare room as - at the end of the print - the plate will always rise about 1cm and go back down before it homes apparently.

 

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.

Sign in to follow this  

  • 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.
      • 86 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!