Whelan shelf dowel fitting

I bought a 5 shelf Whelan steel shelving unit from costco to put my 3d printers on, looking at the extra slots I decided to make a small adapter piece to allow me to hang a 3/4" dowel that I could use to hold my filament for my printers, allowing me to remove the existing spool holders. Didn't have a dowel onhand to show so I grabbed an extra bar from the shelf and stuck it in the part for picture purposes. Printed on a bambu x1 using support filament and spent a lot of time picking the support material out from the pegs.