Do you cut the pipe first to the rough miter shape? Or straight to filing?
If you don't want to waste time, cut a rough fishmouth with a hacksaw, then file.
I thought about it, but new files make light work of thin tubing. It takes less than a couple of minutes to get it roughly the right shape then it’s just a case of finding the high spots.
@Brommers started
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Do you cut the pipe first to the rough miter shape? Or straight to filing?