We have glass blocks for our shower and just throw a towel over the top so we can have access to it from inside or outside the shower. Sometimes, though, the towel doesn't dry well sitting on the glass blocks and it can cause mold to start growing. I designed this rack to sit on top of the glass blocks to allow some airflow under the towel.
I've included a few variations on sizes depending on needs.
The 245mm bars are the largest I could fit on my printer bed (Prusa MK4). The 210mm bars are perfect if you want the brackets to sit on the grout lines and cover two blocks wide. This assumes your grout lines are roughly ½" or 12mm wide.
The brackets come in 12mm, 15mm, and 18mm wide variants. I started off and used 12mm for all three but that didn't provide much space to hold the cross-bars in the middle. They seemed to hold okay, but it felt like it needed to be wider. I switch to 18mm for the middle bracket and it is much stronger.
You'll need to print:
I printed mine in PETG using:
In this configuration, PrusaSlicer says I can get all the pieces in two prints for my MK4:
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The author marked this model as their own original creation.