Wall Toothbrush Holder: A 3D Printed Bathroom Shelf for Toothbrushes, Toothpaste, and Tighter Counters

Best filament for a toothbrush drying rack: use PETG first

For a low-consequence household toothbrush drying rack, PETG is the best practical default: it makes a rigid, durable holder, tolerates routine bathroom moisture better than the usual PLA starting point, and is easier to print accurately than polypropylene. Use an exact polypropylene grade only when you have a real reason, such as a qualified living hinge or compatibility with a named cleaning process. Use TPU only for removable feet, soft retention tabs, or bumpers; it is usually too flexible and too easy to turn into a water-holding crevice for the main rack. In a clinic, school, care facility, or other controlled hygiene program, the required material, cleaning method, traceability, and replacement schedule override this household recommendation.

The rack is not a toothbrush, medical device, disinfectant, or sterile-storage system. No common filament is automatically antimicrobial, biocompatible, skin-safe, oral-contact-safe, or compatible with every cleaner merely because the polymer family sounds familiar. Keep bristles from rubbing printed surfaces, avoid designs that trap rinse water, and retire a rack that stays wet, cracks, delaminates, develops an uncleanable film, or can no longer hold brushes separately.

Drying geometry matters more than the material label

The American Dental Association's current toothbrush guidance says to rinse a toothbrush after use, store it upright, let it air-dry, keep brushes separated, and avoid routinely covering or storing a damp brush in a closed container. A useful rack supports that workflow. Give each brush its own open position; keep bristles clear of shelves, walls, cups, and neighboring brushes; put the handle contact below the grip area; and leave open air paths around the head.

Slope horizontal ledges so drops leave instead of forming a permanent wet line. Use large open drain paths rather than narrow decorative slots that are hard to inspect. Make the drip tray or cup removable without tools. Round accessible corners, avoid blind cavities, and leave enough space behind a wall-mounted rack for a cloth to reach the wall. If water follows a toothbrush handle downward, it should land on a visible removable surface rather than disappear into a screw pocket.

For a travel enclosure, use the separate toothbrush travel-case guide; a closed carry case solves a different short-duration packing problem and should not become the everyday wet-storage default. The draining soap-dish guide is the closer geometry reference for removable trays, open drainage, and keeping a wet object above pooled water.

Qualify cleaning without inventing a sterilization claim

1. Write down the actual routine. Identify the water temperature, soap or named cleaner, concentration if applicable, contact time, brush used on the rack, rinse, and drying time. Do not substitute boiling, a dishwasher, steam, bleach, alcohol, peroxide, or UV because it sounds more thorough; those can exceed what the filament, colorant, adhesive, wall finish, or toothbrush maker permits.
2. Test a representative printed coupon and the finished rack. Look for whitening, tackiness, swelling, warping, odor retention, color transfer, layer lifting, softened hooks, and residue in layer valleys. A datasheet for molded resin or another filament brand does not qualify this print.
3. Run wet-dry and load cycles. Load the heaviest intended electric-brush handle or accessory, wet the rack as it will be used, let it dry, and repeat. Inspect hook roots, screw bosses, adhesive interfaces, removable trays, and TPU-to-rigid joints.
4. Set a simple retirement rule. Replace the rack if cracks, rough damaged surfaces, permanent deformation, loose mounting, persistent film, trapped moisture, or loss of brush separation makes cleaning or use unreliable.

Skin contact is normally incidental because users should handle the toothbrush, not the rack. If the design is intentionally hand-held, rests against skin, or places a printed feature in the mouth, it is no longer the same low-consequence wall-rack problem. Require application-specific material and process documentation instead of extending this household PETG recommendation into a health or regulatory claim.

Final recommendation

Choose PETG for the rigid body of an open, washable household toothbrush drying rack; choose exact PP only for a justified and tested hinge or cleaner-compatibility requirement; and reserve TPU for removable soft features. Put most of the design effort into brush separation, open air flow, drainage, access for cleaning, wall-safe mounting, and an explicit replacement rule. For a custom rack, prepare the brush count and dimensions, wall type, load, drainage layout, cleaning routine, and material requirement with the material-before-quote checklist, then request a production quote.

Evidence boundary

The ADA source supports the upright, separated, air-drying storage workflow. The linked Prusa pages document print and material characteristics for specific PETG, polypropylene, and TPU products. They do not rank every brand, prove a service life, certify this rack, approve oral or skin contact, establish antimicrobial behavior, or validate a cleaning chemical. GoodPrints has not run a first-hand lifetime or contamination-control test on this holder.