We use 0.2mm layers, 20% refill, and Simplify3D. We have a MakerGear M2 and Creality CR-10 and have used both of them to print the robot parts with success. If you'd like, mail us a printed arm and slider, we will examine them and suggest a corrective action. We will then mail them back to you. Please contact us via our contact form at www.otvinta.com/contact.html for further help.