Modeled using OnShape 

I made mine fairly dense 25% gyroid infill (but only because I like it and use it for everything), needed to use a rather large brim to print fast.  It works well in TPU as well

Sized to take a #10 screw and washer

Be smart about the amount of weight you decide to trust it holding, I am not responsible for helping you to think, nor do I know what material you will use, the quality of your printer, how well tuned your profiles are etc. etc. etc.