Hello, I'm also a owner of this printer (sold as "Hesine M505" the black acrylic one - firmware is the same:FIRMWARE_NAME:Repetier_V1.4 ). First some quick fixes of mine (if not already written in this thread): 1) My PSU is rated 15A (on the black hesine). This is much to low, turn the skrew on the PSU to max 13.5V for getting some degrees more on the heatbed and stability reasons. (Meanwhileby madias - Prusa i3 and variants