Bathroom Floor Drain Cover

This is my latest version of design originally made in Tinkercad but recreated in OnShape. Original model here for you to copy and adjust for your own needs. This is designed to replace the drain covers in my showers, bathrooms and laundry. We own a 17 year old "Allam Homes" designed home here in Australia, and the plumbing fittings they used are not standard size and I've been unable to find replacements for the fittings that have aged and weathered and are now yellowing and cracking. These have been working brilliantly since originally installed.