This modular, freely assembled bathroom storage rack emphasizes flexible organization and efficient space utilization, specially designed for the humid and compact environment of bathrooms.

The rack is waterproof, moisture-resistant, lightweight, and easy to clean. Placed in the corner of the bathroom vanity, it makes full use of otherwise wasted corner space.
It features an overall vertical layered structure, with vertical posts and adjustable shelves enabling multi-level storage, effectively saving countertop space. The entire unit is 3D-printed, using mortise-and-tenon joints and slot-based connections for secure assembly, along with a quick-release screw-and-nut system for easy disassembly and cleaning, while maintaining good stability.

All
shelves incorporate a hollowed-out design (the specific pattern can be adjusted in slicing software by modifying sparse infill density and fill patterns), facilitating drainage and preventing water accumulation that could lead to bacterial growth. For honeycomb infill patterns, strength tends to be higher than grid patterns.

Right-side wall-mounted bracket: This additional feature expands lateral storage capacity, perfectly addressing the challenge of organizing long, slender items.

The key advantage of this storage rack lies in its fully modular design, allowing users to freely combine components according to their specific needs:
Side panels can be stacked up to three pieces (more than three layers may compromise stability; if using three side panels, consider printing two back panels at 18 cm height to avoid gaps between side panels and ensure structural integrity). Side panels are joined via mortise-and-tenon connections, then secured with back panels. Additionally, partition boards further enhance stability.
Adjustable shelves: Users can easily modify the number of shelves and adjust shelf spacing to accommodate items of varying heights.
Sealed drawer boxes: These can be added to store moisture-sensitive small items such as cotton swabs or makeup pads, with sliding lids for convenient access.
Wall-mounted brackets: Utilize side space to organize toothbrushes, toothpaste tubes, and other elongated objects.
Hooks: Optional hooks allow hanging towels, bath balls, and other accessories.

Exceptional flexibility: Users can add or remove shelves and components based on available space and storage requirements, making relocation simple and hassle-free.
High space efficiency: Vertical storage combined with lateral expansion makes it ideal for small apartments or rental units.
Bathroom-friendly: Made from waterproof materials and featuring drainage designs, it’s perfectly suited to humid bathroom environments.
Clear categorization: Different zones store distinct types of items, keeping countertops neat and organized.

Here are the assembly steps:

First, prepare the main frame and gather all printed parts. Test the size of the tenons by printing them first, adjusting the X-Y scale to control tightness (two options are available—original dimensions or a -0.1 mm tolerance; I used the original size).
Next, connect the side panels (available in left- and right-hand versions) using the tenons, paying attention to orientation: align the groove direction on the back panel and ensure the partition board’s slots remain consistent.
After installing the side panels, proceed to mount the shelves, ensuring both the bottom and top shelves are securely attached. Additional shelves can be added later depending on usage needs and desired height.
Then install the back panel by simply sliding it into place through the pre-drilled slots.
Next, install the sealed drawer box by sliding it directly onto the track and securing the lid.
Finally, install the side hooks by inserting them through the holes in the side panels and securing them with nuts.
Install the side panel hangers by first aligning the sliding hook with the side mounting box and then securing it with nuts. The base of the side hanger also features a hollowed-out design, similar to the partition and back panel modifications.
Assembly complete. Adjust module positions according to your specific needs.