Several quilters have mentioned problems with half-square (or maybe even other) triangles. I found a tool that lets me make them accurately every time and thought you might like to know about it. That is the Accuquilt GO. I cut them on the GO, they are accurate and have no dog ears, and they piece easily.
To piece an exact 1/4 inch seam, I use either a blind hem foot carefully set to a scant 1/4 inch and with the wheel taped down or a 1/4 inch piecing foot. This depends on what machine I'm using. I chain piece.
Try it. You'll like it.