Funny coincidence that you are posting this topic - I’ve been meddling with the same issues myself. I don’t have such a severe gap as your photo show, but I’ve struggled with getting a snug fit. I’m using estlcam. My working hypothesis is that the mill has a runout, and I have to adjust the mill size in the CAM, to get a snug fit. I’m updating my thread when I’ve tried it out: Fingerjointed boxes (I don’t have too much time to tinker these days, since most of our spare time goes into renovating a holiday house)
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