Jump to content
Ultimaker Community of 3D Printing Experts

Accuracy of printed parts


matthiash
 Share

Recommended Posts

Posted · Accuracy of printed parts

Hello,

I really enjoy printing with my new Ultimaker.

Nevertheless I know observed several times that the scale of printed parts is not accurate.

I m printing parts for a mechanical prototype, which should be mass produced out of aluminum next year.

In the cad drawing the part has a size of 50 mm x 149 mm. When I imported the stl into cura the measures were still the same.

Nevertheless the printed part had measures of 49 mm x 142 mm.

I searched on cura for settings to maybe solve the problem but I couldn't.

For me it sounds like a problem with the gcode, but I have no idea how to handle it.

Did anyone observe the same problem?

Would very much appreciate your help.

Cheers,

Matthias

 

  • Link to post
    Share on other sites

    Posted · Accuracy of printed parts

    UM1 or UM2? Anything non-standard about it?

    You might see differences of a mm or less on X-Y dimensions due to shrinkage, etc. But 149 v 142 is way off from what you should expect. It seems like the steps-per-mm calibration is probably wrong in your firmware.

     

  • Link to post
    Share on other sites

    Posted · Accuracy of printed parts

    No, heated plate might help if the shrinkage is causing the print to warp or crack - but that's usually only the case with ABS. It's just a fact of life that plastic shrinks slightly, and there's nothing you can do about it. Injection molding has similar challenges.

    Do you have an Ulticontroller? If so, look in Control -> Motion for the steps per mm settings, and report them back.

    If not, there's a gcode that shows the settings, but I'm not sure - maybe M503, but I'm not sure if that supported in UM1 standard firmware. Try sending that to the printer using Cura, Pronterface, or whatever you connect with.

     

  • Link to post
    Share on other sites

    Posted · Accuracy of printed parts

    Do the differences change after rotating the part 90°? The shrinkage is extremely unbalanced, 0.5% vs. 3.5%.

     

  • Link to post
    Share on other sites

    Posted · Accuracy of printed parts

    In the cad drawing the part has a size of 50 mm x 149 mm. When I imported the stl into cura the measures were still the same.

    Nevertheless the printed part had measures of 49 mm x 142 mm.

     

    WTF? That's a typo, right? Seriously? If it really printed 7mm short then something is very very wrong.

    With heat off place a ruler on your bed. Move the test head to a postiion over the ruler and then move the test head 50mm. It should move 50mm. Not 48.

    Pronterface is a very useful tool for messing around - moving an axis 10mm at a time or whatever and for examining and changing the steps/mm values.

     

  • Link to post
    Share on other sites

    Posted · Accuracy of printed parts

    If that was a typo then I have totally different advice...

     

  • 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
     Share

    • Our picks

      • New here? Get ahead with a free onboarding course
        Hi,
         
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 11 replies
    ×
    ×
    • Create New...