Jump to content
Ultimaker Community of 3D Printing Experts

New Printer doesnt see its bed size correctly

Recommended Posts

Hi all.

I have just finished assembling a UM2 extended+ the machines inability to bed level is driving me nuts.

when the head moves to level the bed instead of moving to the limits of the bed it treats the bed like its a quarter of its size, when it moves to the second leveling position on the right it moves to the middle of the bed. and prints 25% of the size.

What am i doing wrong? ive set cura machine settings to the correct bed size, but if i cant level when i first switch on correctly what can i do?

ive searched everywhere for an answer i tried all day yesterday, but its findin the correct term to use in google all i can find when i search is people questioning the UM2's printable area!!



  • Like 1

Share this post

Link to post
Share on other sites

There's a feature called microstepping and another feature called "steps/mm". One of those 2 things is off.

There *might* be a jumper to set the microstepping on the board. It's supposed to be set to 16 microsteps per step. steps/mm can be set either in the configuration.h file before building or alternatively if you have tinkermarlin you can set it on the front panel.

The Z axis *definitely* has a jumper to switch between 8 and 16 steps and it's near the center of the board and sometimes people connect their fan to it by mistake. It should be left open.

Share this post

Link to post
Share on other sites

I don't know that board so I can't help you but even so I'm 90% sure that jennyPrinter board will only control microstepping with jumpers. Probably near those 5 stepper drivers. Marlin does support M350 but not for all stepper drivers. Definitely not for the stepper drivers that come with UMO, UM2, UM3. I didn't google 8825 though. But if it didn't do anything then it's not supported (but you might need capital letters so try that also M350, not m350).

It's great that you have pronterface going! Instead/before homing you can move axes. So move one axis at a time.

for example center all axes and then:

G92 X0 (tell the printer X axis at now at position 0)

G0 X10 (tell printer to move X axis to the right by 10mm.

Then measure to see how far it moved. You can't update microstepping through marlin (I don't think - certainly not the marlin that comes with um2) but you should be able to set steps/mm through gcode M92. (not to be confused with G92 above).

For example:

M92 X80.1 sets the X axis to be 80.1 steps per mm.

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

  • Our picks

    • How to 3D print with reinforced engineering materials
      Ultimaker is hosting a webinar where we explain how you can achieve and maintain a high print success rate using these new reinforced engineering materials. Learn from Ultimaker's Product Manager of Materials and top chemical engineer Bart van As how you can take your 3D printing to that next level.
      • 2 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!