The DIY STEM kits for kids at Pound Xtend start with a build-your-own brushless mini fan kit (from $39.99) and a 315-piece nativity building bricks set (from $64.99). Next come magnetic and wooden construction sets from $26.43, and then a few hands-on, STEM-adjacent toys. Here's what kids build, what's in the box and how much adult help to plan for.
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Prices checked October 2026.
Quick picks
- DIY Brushless Mini Handheld Fan Kit: a real assembly project that ends with a working handheld fan.
- Nativity Scene Building Bricks Set (315 pieces): a step-by-step brick build for ages 9 and up, about an hour from start to finish.
- Kids Magnetic Building Sticks: 25, 44 or 100 pieces with a tutorial for building 3D structures.
- 40-Piece Montessori Magnetic Travel Building Set: a compact construction set that goes on trips.
- Electric Wire Loop Maze Game: a buzz wire challenge that trains a steady hand.
True build-it-yourself kits
These are the projects where kids start with parts and finish with something they made themselves.
DIY Brushless Mini Handheld Fan Kit
What kids build: a compact, fast-spinning handheld fan, assembled by hand. What they learn: the kit introduces the basics of motors, mechanical assembly and airflow. In the box: a motor, fan blades, a handle, a battery and assembly accessories, depending on the model.
Adult help: plan on it. The listing recommends adult supervision and gives no age guidance. Follow the manufacturer's instructions, and keep fingers, hair and loose clothing away from the blades once it spins. It suits curious builders and hobby fans who like small motor-powered gadgets. From $39.99. See the fan kit.
Nativity Scene Building Bricks Set – 315 Pieces
What kids build: a stable, a manger, trees and 15 figures, including Mary, Joseph, Baby Jesus, an angel, three wise men, two shepherds, sheep, camels and a donkey. In the box: 315 pieces and printed step-by-step instructions. The finished scene is about 8.5" high, 20" long and 5" wide.
Adult help: it's recommended for ages 9 and up and takes about an hour, so older kids can follow the instructions on their own. Younger siblings can help sort pieces with a grown-up nearby. It contains small parts and is not suitable for children under 3. Once it's done, it stays out as a display for the whole season. From $64.99. See the 315-piece set.
Open-ended construction sets
These sets have no single finished model. Kids design their own builds, which is where engineering thinking starts: try a shape, see whether it holds, then change it.
Kids Magnetic Building Sticks – STEM Construction Toy
What kids build: shapes, patterns and three-dimensional structures from sticks that connect magnetically. In the box: you choose 25, 44 or 100 pieces, and each option includes a storage box and a tutorial, so kids have a starting point before they go freestyle.
Adult help: mainly safety. The set contains magnets and small parts and is not for children under 3. Keep pieces away from toddlers. The recommended age isn't listed. From $26.43. See the magnetic sticks.
40-Piece Montessori Magnetic Travel Building Set
What kids build: shapes and small structures from 40 magnetic pieces. The listing says this practices spatial awareness, problem-solving and fine motor skills. In the box: 40 magnetic pieces, plus a storage case or travel accessories if included with the set.
Adult help: supervision is recommended and no age guidance is listed. It's sized as a travel-friendly set, so it's an easy pick for car rides, visits to relatives or a classroom corner. From $29.99. See the 40-piece set.
Kids Wooden Toy Set – Montessori Educational Building Toys
What it is: a wooden, Montessori-inspired eight-in-one multi-function activity box for screen-free play. Good to know: the eight activities, the piece count and the recommended age aren't listed, so message the team to confirm the contents before you order. It contains small parts, so supervise young children. From $44.26. See the wooden set.
STEM-adjacent hands-on toys
These aren't build kits, but they work the same muscles: planning, coordination and cause and effect.
Meow Rail Car Engineering Toy
This cat-themed set combines trains with construction play. Kids build tracks, send the train out on adventures and make up their own stories. Track layout, piece count and power source aren't confirmed, so check with us if you need those details. Choose 1, 2 or 3 packs. From $39.64. See the rail car set.
Electric Wire Loop Maze Game
This is a classic buzz wire challenge. Kids guide a metal loop along a winding wire, and it buzzes if they touch it. It builds focus, patience and hand-eye coordination, and it doubles as a family or party game. Battery type and recommended age aren't listed. From $26.43. See the wire maze.
How to choose a DIY STEM kit
- Decide between a project and open play. A kit like the fan or the brick set has a clear finish line. Magnetic sets are open-ended and get rebuilt over and over.
- Be honest about adult time. Motor and electronics kits usually need a grown-up at the table. Instruction-led brick builds suit kids who can follow steps on their own.
- Check the age and safety notes. Magnets and small parts don't belong around toddlers. If a listing doesn't give an age, ask before you buy.
- Read the box contents. Note what's included, such as batteries, instructions or a storage case, and what may vary by model.
- Think about storage. Sets with a box or case are much easier to keep complete.
- Match the theme to the kid. A train fan, a gadget lover and a holiday decorator will each get more out of a different build.
Frequently asked questions
What is a DIY STEM kit?
It's a set of parts that kids assemble into something that works or stands, while picking up a science or engineering idea along the way. The fan kit, for example, introduces motors and airflow.
Do kids need adult help with these kits?
For the fan kit, yes: adult supervision is recommended. The 315-piece brick set is recommended for ages 9 and up and comes with step-by-step instructions. For magnetic sets, adults mostly need to keep pieces away from children under 3.
Does the fan kit include a battery?
The listing includes a battery among the components, depending on the model. Message us and we'll confirm the details for your order.
How long does the nativity bricks set take to build?
About one hour, following the printed instructions.
When should I order DIY STEM kits for Christmas?
Order by early December. Orders are dispatched in 2–3 business days, and delivery usually takes 4–12 business days after dispatch. Shipping is $6.98 flat rate in the US, or free on orders of $49 or more. We can't guarantee arrival by a specific date.
Can I return a kit?
Yes. Unused items in their original packaging with tags can be returned within 14 days.
Ready to pick a project? Browse the full building and STEM toys collection, explore more educational and interactive toys, or check the Christmas shop for more holiday gift ideas.