George0

I tried 62Bricks's method using 3x3 wedge plates but found that it was too fragile to hold on to anything much at 45 degrees. So I used another method I had used earlier, successfully: I made my angles using plate hinges (BrickLink part no. 2429c01) . These can be adjusted to any angle up to and including 180 degrees, have relatively high friction, and can be obtained in a variety of useful colors more easily than 3x3 wedge plates. Their disadvantage is that they may be difficult to adjust to specific angles; in my case, I made an octagon using 4 of the wedge plates and 62Bricks's idea, then fitted the octagon inside the one I had formed using the plate hinges (this works since the angled sides of the octagon are slightly less than the length of a 3-stud brick), to obtain the correct angles.