Smooth Release
Designed for easy release without sticking or cracking, leaving your bath bomb with a clean, smooth finish every time.
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Rainbow Bath Bomb Mold
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$13.55
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Good for: Party bags and gift toppers
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2-Year Warranty Against Defects
On every mold
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Ships in 1–3 Business Days
Tracked worldwide
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Durable Materials
Built for batch after batch
★★★★★
“Every batch turned out perfect. They look like something you'd buy in a fancy boutique.”
— Klaudia W., Verified Buyer · 2" Cube Mold
Why Makers Love This Mold
Every batch comes out crisp, clean, and ready to gift — whether you're making two or two hundred. It's the kind of result that makes people ask “did you really make this yourself?” New to bath bombs? Read our beginner's guide →
Multiple Sizes
Choose the same mold design in different sizes to suit various products, occasions, and bath bomb-making needs.
2-Year Warranty
Covered against manufacturing defects for two years when used normally and cared for according to our instructions.
Easy to Clean
Rinse with cold water, allow it to dry completely, and store it in a cool, dry place between uses.
Description
Bring the colors of the sky into your bath time with our vibrant Rainbow Bath Bomb Mold! Designed to capture the stunning beauty of a full-spectrum rainbow, this mold allows you to craft bath bombs that are as colorful as a perfect weather day. With its high-quality, 3D-printed design, you can create bath bombs that brighten up any bathroom with every vibrant hue. Perfect for adding a touch of weather-inspired magic to your creations, this mold is a must-have for bath bomb makers looking to bring color, cheer, and creativity into their products.
Available sizes: 1.5" | 2" | 2.5" | 3" | 3.5" | 4" | 4.5"
Parts:
- Rainbow Bottom Piece
- Rainbow Top Piece
- Rainbow Bath Bomb Cylinder
How to Use:
- Place the bottom piece of the mold on a flat surface.
- Attach the bath bomb cylinder/sleeve around the bottom to create a stable frame.
- Fill the mold with your bath bomb mixture, ensuring it’s packed evenly but not too tightly.
- Insert the top piece/plunger into the cylinder and press firmly to shape the 3D design.
- Gently lift the top/plunger, slide off the cylinder, and remove the bottom base.
- Allow the bath bombs to dry for 24 hours before packaging or using.
Care Instructions:
- Clean the mold using cold water; avoid hot water and dishwashers, as the PLA material is heat-sensitive.
- Store the mold in a cool, dry place away from direct sunlight to prevent warping.
- Do not soak the mold to maintain its durability.
Crafted with precision using 3D printed bath molds, the Rainbow Bath Bomb Mold lets you create bath bombs that capture the beauty and brilliance of a vibrant rainbow. Whether you're crafting colorful creations for personal enjoyment or adding a burst of color to your product line, this mold delivers detailed, professional-quality results that reflect the magic of weather and color. Enhance your collection of custom bath bomb molds and design stunning, handmade bath accessories that brighten every bath with rainbow-inspired joy.
How to use
- Place the bottom piece of the mold on a flat surface.
- Attach the bath bomb cylinder around the bottom piece to form a stable frame.
- Fill the mold with your bath bomb mixture, ensuring it’s even but not too packed.
- Insert the top piece/plunger into the cylinder and press firmly to create the detailed Charizard design.
- Gently lift the top piece, slide off the cylinder, and remove the bottom base.
- Allow the bath bombs to dry for 24 hours before using or packaging
Shipping & Warranty
Free Standard FedEx Shipping (orders over $100): 7–12 business days
FedEx Express Shipping: 1–2 business days (available at checkout)
All shipments include tracking.
All molds include a 2-year warranty with normal use.
Care instructions
- Hand wash in cold water after each use — no hot water
- Dry thoroughly before storing
- Do not soak
- Store away from direct sunlight
- Not dishwasher safe — hand wash only
- Store in a cool, dry place
Find your size
Which Size Is Right For You?
Not sure which to pick? Here's what each size looks like — and what people use it for.
1”
About thumb-sized
Great for party bags, grab bags, and gift toppers.
$11.55
1.5”
About golf ball-sized
Perfect for gift sets, favors, and bundles.
$12.90
Most popular
2”
About ping-pong ball-sized
The classic size. One per bath. Works for everyone.
$14.30
2.5”
A bit bigger than a golf ball
Feels generous, looks great, a crowd favorite for gifting.
$16.80
3”
About apple-sized
Great for selling on Etsy, looks premium in packaging.
$19.50
3.5”
A little smaller than a tennis ball
Big enough to wrap and give on its own, a real treat.
$22.80
4”
About softball-sized
A showstopper. One bomb for a long, deep soak.
$26.40
Build your collection
The Starter Set — 3 Shapes, Endless Variety
More Than Just a Bath Bomb
Common questions
Questions About the Cube Mold
What size bath bomb mold should I buy?
The 2" is our most popular size — it makes a bath bomb that's perfect for a single soak and fits nicely in packaging. If you're making party favors or gift bag fillers, go smaller (1" or 1.5"). If you want something that feels luxurious to gift or sell, try the 3" or 3.5". Oursize guideshows exactly what each size looks like.
Will this mold work with my bath bomb recipe?
Yes — this mold works with all standard bath bomb recipes including citric acid and baking soda bases. The smooth interior walls are designed for clean release regardless of your exact formula. If your mixture is wetter than usual, let the bath bombs set for a few extra minutes before removing.
How long does the mold last?
With normal care, these molds last for hundreds of batches. Every mold comes with a 2-year warranty — if it develops a defect in materials or workmanship under normal use, we'll replace it. Just contact us.
Can I use this mold to sell bath bombs?
Absolutely — many of our customers run Etsy stores, sell at markets, and supply local boutiques using these molds. The 3" and 3.5" sizes are especially popular for retail-ready bath bombs. If you need a custom shape or logo pressed into your bath bombs, check out ourcustom mold service.
How do I clean and store the mold?
Rinse with cold water after each use and dry thoroughly before storing. Avoid hot water. Do not soak or put it in the dishwasher. Store in a cool, dry place away from direct sunlight.