Tall prints

Hi, printing on a prusa i2, ed3 hotend with cooling
Getting my prints coming out taller than expected but not wider or lengthwise

Attached is a pic of a bought i3 leg in blue pla, and my printed i3 leg in organge pla.
I never had these problems before, nothing changed in code and I've made sure all bearings are lubed and move smoothly

Your z steps per millimeter value is wrong. Use one of the reprap calculators to help you determine what it should be. Make sure you know what level of microstepping you are using.

ok so i changed my steps per mm
i cant for the life of me get the updated software onto my board
im using a printrboard rev d

i have the file opened in arduino, when i select upload it says done uploading, but "avrdude: ser_open() can't set dtr for "\\.\com5" " comes up and when i start a print i still have same print height issues

flip instaler will not open on my pc, what looks like a dos promt window opens for a second and nothing loads

any ideas?