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UPDATE 2021.10.01 - Per request, I've added a brace to space the halves out to accommodate 26cm-tall Club Mate bottles.

Heavily customized the parametric can dispenser (https://www.thingiverse.com/thing:2819151) to use with water bottles. I used the SCAD script to create the basis with the correct dimensions. I made a hex cutout pattern for airflow in the refrigerator, omitted the top and bottom braces, and I added some much stronger insertable braces instead.

The rack itself prints in 4 separate pieces that each fit on my Prusa Mini's 7in print bed.

This rack holds 9 standard 500mL water bottles.

Assembled dimensions are:
Width: 21.6cm (~8.5in)
Height: 17cm (~6.5in)
Depth: 31.75cm (~12.5in)

Print Settings

Rafts:No

Supports:No

Resolution:400

Infill:15

Filament:PLA

Notes:

Print each of the four components, plus four of the braces. You will need two-part epoxy or a lot of superglue to assemble the pieces.

This takes a long time to print and uses almost a full kg roll of filament. I advise you to use a 0.8mm nozzle and print at 0.4mm layer height to save a lot of time.