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It may depend on the type and brand of filament you are using. I have printed dozens of these in both PLA and PETG, and I have always trimmed the parts after printing with an Xacto blade and not had any splits or breaks occur on the mount pegs. There have been tens of thousands of downloads and at least a couple thousand sets printed and installed. I have only had a very few people including you and BoothyBoothy mention an issue of the mount pegs and M3 screws. Having said that, I will look at changing the mount peg slots to be wider (for M3 screws) but not have any recess to increase strength. I will post an update in the next day or two. Thanks. for the feedback.