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upgrading firmware version squashes mesh

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I ran into a weird issue today.

For a while i have been running 14.09 version of cura. but i have been running fw: 13.03 since well forever.

I use the sd card with my umo.

Today, I realized that i haven't upgraded the firmware in quite a awhile, so i decided to try the latest and went for the one that ships with cura 14.12.1.

As i was reading about some of the fixes that have been done in the last few releases of the firmware.

I re sliced my mesh and tried to run it and the mesh ends out getting printed squashed. see the image.


Um firmware issues

So i tried slicing with both 14.09 & 14.12.1 and both slices print squashed.

If i revert back to 13.03 firmware the prints exported from both 14.09 & 14.12.1 print correctly.

Can some one explain why this might occur?

I will try later this evening to go to the firmware that ships with 14.09 to see if that has the same issue.

edit: i have since reverted back to 13.03 to make sure that the issue only occurs with the firmware and it does.




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Do you have a heated bed? Or did you select UMO w/HBK ? This issue is probably due to the HBK having a different steps/mm.

In Cura, go to FIle -> Preferences and select PronterFace as the Print Window UI. Then select File->Print to open the Pronterface UI. On the right there is a window that shows output from the printer. At the bottom of that window there is a small input box that is used to send commands to the printer.

In the small input box, enter:


and the printer will response with information about the current settings.

Look for the value that is prefixed with Z under the heading "Steps per unit:"

Without the HBK upgrade, the Z value for steps per unit is:


With the HBK upgrade or the firmware for it, it will be:


So if you use the HBK firmware but do NOT have the HBK, the firmware steps 200 steps for every 1 mm of Z movement where it should step 533.33 steps. The result will be that the height will be squashed to about 40% of normal.

It's best to find and use the correct firmware. However, if you reflash the firmware you used before, you can probably correct it by copying the entire line under the "Steps per unit:" that begins with M92 and paste it into the small input box and then edit the Z value to be 533.33 and press return.

Reissue M503 to ensure the value is set correctly.

Then issue:


which will save the settings in non-volatile memory.


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Yes, you have most probably uploaded the 'wrong' firmware.

As stated above, the HBK firmware is only for the official UM kit, with a different Z stage. You should not use that one if you have a custom heated bed (or no HB at all). There are other small changes related the official UM HBK in that firmware...

(And for the 'normal' UMO, there have been very few changes in the firmware over the last year, so there is almost no reason to upgrade anyway. New version of Cura comes with new version of the firmware so that all versions are aligned, but it is basically the same code compiled with a new version number...)


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