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  1. The change was not from 3mm but to 4mm long screws. As said, this is for Brazil only. If you are not from here, please, just ignore the file. My friends loved it ;-)
  2. This is not a beginners print. If your printer is not yet calibrated, ask a friend and print again when your printer is better calibrated. Use 0.25mm layer with the settings in the instructions and it will be very strong.
  3. As explained in the text, when printed on the back it is fragile. Printing on the side is more trouble but has superior result.
  4. The idea of the quick release is not mine, have you read the "derived from"? and I don't even understand what you dislike about my implementation.