Reviews
Engino Cams & Cranks STEM04, box with pumpjack model
Engino Cams & Cranks STEM04, several models built
Engino Cams & Cranks STEM04, flapping eagle and other models
Engino Cams & Cranks STEM04, learning booklet pages
Engino Cams & Cranks STEM04, parts and instructions
Engino Discovering STEM Mechanics: Cams & Cranks STEM04

Images: Engino

Researched

Engino Discovering STEM Mechanics: Cams & Cranks STEM04

A 122-piece Engino kit with a theory booklet for 8 working cam and crank machines.

$37.99 at Engino · Price checked Oct 7

Prices at other stores may differ · Links go to the retailer


Our verdict

Cams & Cranks is part of Engino’s Discovering STEM Mechanics line: 122 snap-together parts that build 8 working models, one at a time, including a fishing crane, an oil pumpjack, a moving figure, a moving bridge, a sewing machine, a flapping eagle, a stationary bike and a windmill. The printed booklet covers the theory, experiments and quizzes, with printed instructions for 1 model; the other builds are in Engino’s free kidCAD 3D viewer. A parts-extraction tool is included. Engino rates it 9+ and sells it for $37.99 on its US site.

The product page shows 19 reviews averaging 4.89; the five we could read all carry the same date, September 18, 2025, which suggests they were imported in one batch. A middle-school STEM teacher likes the rotatable 3D instructions in the app, a parent of a 9-year-old says he built nearly every project in the booklet, and a parent of a 7-year-old enjoyed it but wanted more complexity for handy kids.

It suits a 9 to 12-year-old who likes to see why a crank turns into a flap or a pump stroke, and homeschoolers who want the theory in the box. Skip it if you want a display model or a single big build, or if you would rather not use a tablet or computer for most of the instructions.

Key details

  • Ages 9+
  • 122 pieces
  • 8 builds
  • STEM kits
  • Engino
  • Available

More info

  • Item number: STEM04
  • Age: 9+ (Engino)
  • Pieces: 122
  • Models: 8, built one at a time
  • Instructions: 1 printed, 8 online in kidCAD 3D viewer
  • Includes: Learning booklet, parts extraction tool
  • Line: Discovering STEM Mechanics
Best for and who should skip it

Best for

  • Kids 9 to 12 who ask how engines, pumps and machines move
  • Homeschool or classroom units on simple machines
  • Builders who like to take a model apart and try the next one

Skip it if

  • You want printed instructions for every build; only 1 of 8 is printed
  • Your child wants one large display model to keep built
What we like and what to keep in mind

What we like

  • 8 working mechanisms from one box of 122 parts
  • Booklet adds theory, experiments and quizzes to each build
  • Free kidCAD 3D viewer lets kids rotate and zoom each step

Keep in mind

  • Models are built one at a time, so earlier builds come apart
  • The readable reviews all share one date, so we weigh them lightly
  • Most instructions are on screen, through the kidCAD app or site
How we reviewed it

This review is researched: based on the maker's specifications and public owner reviews, checked Oct 7, 2026. We have not tested it hands-on.

Engino Cams & Cranks STEM04, box with pumpjack model

Engino Discovering STEM Mechanics: Cams & Cranks STEM04

Researched · Ages 9+

$37.99

Links go to the retailer

Check price at Engino

Engino Discovering STEM Mechanics: Cams & Cranks STEM04

$37.99 · Links go to the retailer

Check price

What owners say.

  • 2 positive
  • 1 mixed

Paraphrased from public owner reviews. Each one links to where it was posted.

Positive
A middle-school STEM teacher likes the free kidCAD app’s rotatable 3D instructions and says students enjoy the kits with moving parts such as gears, cams and cranks.
Engino US site reviewSep 18, 2025
Mixed
A parent says their 7-year-old found it fun and a fair amount of work, and that handier kids may want more complexity.
Engino US site reviewSep 18, 2025
Positive
A parent says their 9-year-old built almost every project in the booklet and then looked up other kits in the series to try next.
Engino US site reviewSep 18, 2025

Sources.

What we read for this review, and when we last checked it.

  1. 01 Engino. Discovering STEM Mechanics Set: Cams & Cranks engino.com · Checked Oct 7, 2026
  2. 02 Engino. Cams & Cranks customer reviews engino.com · Checked Oct 7, 2026

How it compares.

This toy next to the alternatives we suggest, using the maker’s details.

Detail Engino Cams & Cranks STEM04, box with pumpjack model This reviewEngino Discovering STEM Mechanics: Cams & Cranks STEM04 Thames & Kosmos Physics Workshop, box with models and manual Thames & Kosmos Physics Workshop 625412 KiwiCo Flex & Fly Plane Launcher, launcher and two foam planes KiwiCo Flex & Fly Plane Launcher 5907
Price$37.99$59.95$44.95
Maker’s ageAges 9+Ages 8+Ages 9+
CategorySTEM kitsSTEM kitsSTEM kits
Pieces122305–
Good forKids 9 and up who want to know how machines moveKids 8 to 12 who like to build and ask whyKids 9 and up who like flight and outdoor play
StockAvailableAvailableAvailable

Prices are the list prices we saw on the maker’s site and change often.