Holy Boaty

The original Boaty model left my back too sweaty, so I have added ventilation. Introducting, The HolyBoaty. Also, it helps identify ringing on the printer. the whole with a flange is 4mm inner diameter in the model and the non-flanged holes are 3mm in diameter if you would like to measure for hole diameter compensation.

the original model had nothing that could show ringing on a part. so I added some holes.