dimensional error in x-y axis

hi, i have a mass portal's delta print. in this when i print any  square object this objects are print like trapezoidal shape. why this kind of error occur? can any one help me to solve this issue? and which type of parameters change?

Not the answer you’re looking for? Ask a new question to Deltaprintr experts active on Talk.

The 3D Printing Handbook is available now

If you’re a professional looking to master the key aspects of 3D printing, this book is for you.

The 3D printing handbook