Simple 3D Lac Holder for wall and heavy shelfs

I am building my printfarm and try to optimize and design all the things I need. That's why I designed this holder for my 3dLac Cans. 

I updated the design to support Screwheads of 4mm depth.  I use this everywhere, so this is a logical step to support a proper hold of the holder.

Printed with no support and .3 mm layer height. 

If you like it I appreciate your make and rating. 

Thank you!