Simple Hooks for Wire Shelving, 5mm and 3.5mm wire

In our kids' bathroom, we have a wire-shelf corner shower caddy.  Some of the kids use a loofah which can take up a lot of space on the little shelf.  They asked if I could come up with a hook to fix that.  After a couple iterations, here is a very simple “S” hook that fits alright and frees up some shelf space.

I designed two hooks, although they are very similar, because the shower caddy uses two different gauges of wire.  Models were designed in FreeCAD using millimeters (not Freedom Units).  The hook hook is about 50 mm top to bottom and the hook diameter is about maybe 24 mm.

I printed mine out of PETG and I printed them with 100% infill (only took about 20 minutes for two on my Anycubic Vyper).

Printer used: Anycubic Vyper
Filament: PETG, white
Infill: 100%, concentric pattern throughout
Nozzle temp was about 230 C
Bed was 80 C
Speed was 70mm/s
Print time: about 20 minutes (I printed two hooks at a time)

When first installing them, the small hook end is supposed to flex a little and then “snap” on around the wire.  The hook might spin freely, but it shouldn't pop off.  If it slips off too easily, the wire hole is too big.

Because I printed mine solid, I could also fine-tune the hole diameter with a drill bit.  I used Freedom Unit drill bits (3/16th and 9/32nd) to ream the hole a bit and clean up the edges (that is, the elephant foot on the bed-side of the hook).  See the photos - the photo with the drill bits show two hooks that have been cleaned up and reamed next to two hooks at printed.

So far, these hooks have helped to free up shelf space on the caddy - so I get to put on my flight suit and stand under the Mission Accomplished banner.

These hooks could also be used on any other wire shelf, like a closet shelf or wire rack.  Just scale up or down in your slicer to get the gauge you need, print solid, and ream as needed.