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

problems with cura's steps per E wizard

Recommended Posts

my ultimaker is working very nicely in general. I have one mayor issue though.

I can't seem to get steps per E under control. sometimes it seems fine, other

times there is simply not enough material extruded (never had the issue of

blobbing/too much material. now if I use the wizard to configure the setting

I arrive at around 810 to 820 steps which is nowhere near enough if I then try

to print. I mostly use around 880 steps which mostly works fine (but sometimes

doesn't). have you made similiar observations or is something wrong with my setup?

(note that if I rerun the test and I use the calculated values my ultimaker extrudes

exactly 100 mm, so the calculation at least is correct).

oh and by the way, why doesn't cura have a material multiplier while printing?

that would make it really easy to save a print...

Share this post


Link to post
Share on other sites
I don't have a way to digitally measure my filament, but 2.85 should be more or less correct I think.

So you are basically saying that you alter a parameter (steps) but don't find it necessary to validate a second, related (and coupled) parameter? One that accounts for a square function (^2) regarding volume? *ahem*

Share this post


Link to post
Share on other sites

as I said, I validated the diameter as well as I could.

so you're saying this could account for as much difference

as I notice? I don't really think this can be the issue though,

because my filament is rather more than the stated 2.85

(which would result in more material extruded than set).

Share this post


Link to post
Share on other sites

You could try to set the number for filament thickness (diameter) to a smaller value, 2.80 or 2.75 while not changing the E setting.

To my knowing (for what it's worth), the E value is quite fixed, as the ratio of movement is dictated by the physics of the stepper motor itself (how far it moves per impulse) and the gear ratios. So as long as the bolt grips the filament tight(!) it should always push 100mm with the same (unchanged) setting for E - because that is basically a linear feeding process. - Just be sure that the bolt grips the filament (you should feel it being pulled into the extruder, when you try to stop it from moving. IIRC the extruder is / should be able to lift 3-5kg of weight when pulling in filament).

The volume on the other hand is a bit tricky, as it depends foremost on the diameter, but that diameter isn't necessarily constant along the length of the filament. I measured one of my 100m spools and found values like

2.76 2.82 2.87 2.83 2.76 2.74 2.79 (actual values from the filament i currently use).

So you can't even be sure that the test you print now is exactly the same as the one with filament 2 meters into the spool.

Also (theoretically) your PLA (if you print with PLA) can accumulate humidity which accounts for volume / diameter but not to plastics (but to vapor). But that's usually negligible.

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

    • Introducing Ultimaker Cura 3.6 | Beta
      Ultimaker Cura 3.6 | Beta is available. It comes with new features, bug fixes, and UX improvements. We would really like to have your feedback on it to make our stable release as good as it can be. As always, you can download the beta for free from our website, for Windows, MacOS, and Linux.
        • Like
      • 95 replies
    • Print Core CC | Red for Ruby
      Q: For some users, abrasive materials may be a new subject matter. Can you explain what it is that makes a material abrasive when you are not sure which print core to use?
      A: Materials which are hard in a solid piece (like metals, ceramics and carbon fibers) will generally also wear down the nozzle. In general one should assume...
        • Like
      • 30 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!