About this 3D model

I'm new to the 3d Printing community, so plz feel free to comment, suggest, help me to improve. Thoughts about it: Should be durable, round steppershaft should be able to be tightened quite tough, should be easy to print small z-axis adjustements should be possible This item may look a bit similar to others here, but i ensure u i made it right from scratch, and if u're interested i can mention the details.