When you are applying upward pressure on the end of your acrylic, you will feel it start to move against your hand, then it will move very quickly. You must wait until the moment when you feel the material "slump" as you have no way of measuring the heat. The problems with this bend were caused by not applying the heat source close enough to the jig and bending the material before the material was evenly softened across the entire width of the material. The bend is kinked, not even, and is too far away from the jig, so it is not straight and square with the end of the material. In the photo below, you can see a poor bend in a sheet of 1/16-inch thick plexiglass. Bending Before the Material Is Soft Enough.Run your heat tool gently back and forth along a cut plastic edge to soften it just enough that it turns clear. You can use the same heat tool you use to bend plastic, to seal and neaten the cut edges of any plastic parts. You must use two hands to do this with even pressure, or your material will twist slightly as you bend it unless you are working with a very thin, narrow strip. When you feel that your sheet is allowing you to push up evenly on it, remove your heat source and set it safely aside on a stand or heat-resistant surface the end of your tool will be hot! Hold the sheet material evenly with both hands (both in protective gloves) and push the sheet up gently bending it against the line of the jig as shown in the photo above. It should not be softer on one side than on the other.
You should be able to feel this point evenly along the full width of the strip you are bending. There will come a point when the material will move upward easily as it reaches a molten state.
While you are applying even heat along the bend line, press gently upon the sheet of material you are bending.
If you turn your heat source as you pass across the acrylic, the heat won't be evenly applied across the entire width of your sheet. Try to keep the heat source at a right angle to your sheet of plastic/plexiglass.