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Printing problems after heated bed upgrade

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I am very new to 3D printing. I bought a Ultimaker Original a few months back, and recently installed the heated bed upgrade for it. Ever since the upgrade, the prints are twice as high as the design. So, if the part is 1cm high, the prints are stretched to 2cm high. Also, the prints are soft and weak. It seems like the z-axis is moving down twice as much as it is supposed to, but I dont know how to solve this problem.

I did do the firmware upgrade, but it still has the same problem.

Any help or suggestions will be much appreciated.

Kind Regards

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There is a jumper near the Z stepper that controls if you are doing 16 versus 8 microsteps per step. It could be that you removed or added that jumper or it could be your used UMO was so old that you had it in the opposite configuration as the "newer" UMO printers. Changing the jumper won't hurt much - it works either way but you have to adjust steps/mm such that your z axis moves the correct distance.

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