I made this little piece to block Y smooth rod of prusa P3Steel (Leonardo type by Irobri) because rods are cutted at 340 millimiters and they will end at the edge of frame without any possibilities to block them. Using this piece, you can secure rods to frame without any other modification to them such as threated hole on each side to use washer and screw or making longer rods and block them using Sieger ring, or any other things. It is also possibile to fix this block to the frame using n°2 screws but in my case (using P3Steel frame painted) it is not necessary because they will stay very tight! Enjoy ^_^Slide it from top over Y rod's guides, that's it.