I designed this wall mount to hold 3/4 inch PVC pipe securely horizontally and vertically. You will need to print two pieces to create a complete mount. One item is the base and the other is the mount itself.  The mount should be placed on it's side to avoid any need for support material and to print quicker. The two holes for the screws are large enough to allow a #6 size  pan head screw to pass through. You can use a #8 size pan head screw, but you will have to "thread" the screw through first.  The mount and the base have a align tab on both sides, there's a 1/32 of an inch space between them that helps to lock down on the PVC pipe. I created these mounts to make a multi tier PVC pipe "shelf" system to hold four of my remote control planes, three foam/electrics and on large gas powered plane. These mounts have held all that weight while being mounted vertically and I only used three mounts on each side.