Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  
j3d

More consistent bed leveling - BEST practices?

Recommended Posts

I would like to be more consistent with bed leveling. I'm using paper at .005 inch thick (.127 mm) but it seems that can be too tight. I would like to use shim stock at .0055 or .006 inch (.140 or .152 mm). But with springs involved, and with various thicknesses of glue, what are the best practices for the most consistent bed leveling?

If this topic has been covered before, links appreciated!

 

Share this post


Link to post
Share on other sites

The thickness of glue should be irrelevant; if you are doing it right the glue should be almost imperceptibly thin; apply it lightly and then spread it with a wet paper towel until it all dissolves. Then allow it do dry during the bed heatup, so that it leaves an almost invisible film on the glass.

I get to level a lot of print beds every day, and here's how I do it:

The first thing to do is to make sure that all of your springs are reasonably tight. If they aren't, it's impossible to find the right height with a single sheet of paper, because the tension on the springs is minimal until they're compressed a bit. So, look through the bed from front to back, and adjust the back thumbscrew until the terminal block in the back left corner is about 1mm from touching the lower plate. Tighten the front screws about the same amount, to keep the bed roughly level as a starting point.

Then heat the nozzle and make sure it is clean at the tip.

Now run the leveling wizard again. When adjusting the rear height, just use the dial on the front of the printer. When adjusting the front corners, use the thumbscrews. I recommend not using the 1mm-then-a-paper-thickness approach. Instead, on both passes level the bed to the point where the nozzle just touches the glass. This is easy to see if you look along the surface of the glass; you can see the nozzle touch its own reflection. This approach will leave you 0.1mm closer than the firmware expects, but in conjunction with a 0.25 or 0.3mm first layer height, it helps to ensure that the first layer gets nicely squashed onto the glass for good adhesion.

When setting each point, move the bed up until it just touches the nozzle tip, then back it off and allow it to settle untouched, and then gently close the gap again.

If you find that you cannot compress the front springs enough to get the bed down to where it needs to be, then simply raise the back of the bed a few turns of the thumbscrew, and restart the leveling wizard. You want to end up with all the springs in a middle position, with a gap of about 10-13mm between the two plates of the bed assembly. The springs should be neither totally compressed, nor so loose that they aren't applying any meaningful upward force on the bed.

By doing two passes at the same height you should get fewer surprises; the second pass around should only require very minor adjustments. And aiming for the point where the nozzle touches the glass is a much easier target than trying to interpret the feel of nozzle on paper tension.

 

Share this post


Link to post
Share on other sites

But 'feeling' resistance of a sprung bed against a small nozzle is very hard to do consistently anyway - especially if the springs are not properly compressed. What you want to avoid is leveling it too high, because then the first layer won't stick; I think that most of the time people overthink it. The only thing the bed height adjustment affects is the first layer; so just level it by eye - you'll take a fraction of the time, and end up slightly too close which is good for first layer adhesion anyway.

 

Share this post


Link to post
Share on other sites

The software expects .1mm (.004 inch). If you use thicker or thinner shim then it won't be as good as a .1mm shim.

I recommend you do the leveling procedure only once ever on your machine. It's great for getting within .1 or even .05mm accuracy. If you ever need more accuracy just print a layer and adjust the screws based on what you see in the skirt or brim.

The machine is good at keeping it's leveling. I only have to go back to the leveling procedure if I add blue tape (which I haven't done in months) onto the glass.

 

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  

  • 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
      • 16 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!