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How are you setting z zero? Looks like you’re setting it too low. Most of the time this happens with a v-bit that had a flat tip. Try zeroing .2mm higher than the surface of the stock. If you can measure the diameter of the flat, try out my Google sheet that’ll tell you how much higher you should set zero.
Also, get yourself a quality 1/4" shank v-bit. Those Inventables ones with the 1/8" shank aren’t great. The angle might be 61° or 62°.
