Free

Propeller Generator by Koolm

Propellers, fans and rotors with NACA airfoil blades, set by size, pitch and blade count

Propeller Generator by Koolm is a free browser tool on MakerWorld for RC props, fan blades and spinning toys. Free; MakerWorld login needed. Exports STL and 3MF. Last checked 26 September 2026.

Open Propeller Generator by Koolm See alternatives

Opens makerworld.com

At a glance

Price: Free; MakerWorld login needed
Runs on: MakerWorld
Exports: STL, 3MF
Multicolor: No, single color
Account: Required to download
Open source: No
Skill level: Some learning curve
Best for: RC props, fan blades and spinning toys
Selling prints: Not allowed CC BY-NC-SA license on the model page: non-commercial use only, so you may not sell prints.
How we checked: Read the tool page and docs Model page: blade count, pitch, elliptical taper, NACA airfoils, spinner and shroud; four PETG example profiles; about 21,500 customizations
Last checked: 26 September 2026

Open generator

Sources: MakerWorld model page (description and CC BY-NC-SA licence) (checked 26 September 2026)

Something out of date? Let us know

Made Propeller Generator by Koolm? Get the listing badge

What is Propeller Generator by Koolm?

Propeller Generator by Koolm is a free MakerWorld customizer that turns a handful of numbers into a printable propeller, fan or rotor. It comes from the maker of the well-known gear, screw and spring generators and has passed 21,000 customizations and 2,500 likes since it went up in September 2025.

You start with the basics: number of blades, overall diameter, spin direction, root size and pitch. From there you can shape the blades with elliptical, linear or constant taper, pick NACA 4-digit airfoils that thin out from root to tip, and add sweep, a root fairing, a spinner, a shroud ring and a hub with a shaft hole. Four example setups for an RC plane prop, a PC fan, a pullcopter and a toy boat list their settings, so you can copy one as a starting point.

It suits RC hobbyists, tinkerers and anyone replacing a fan or toy prop. There are a lot of settings, and values like chord fraction make more sense if you know a little aerodynamics. The author's example prints use PETG with full infill, supports and a raft, with a reminder to test spinning props with care. The script is shared under CC BY-NC-SA, so selling prints is not allowed.

What you can make

RC plane propellers
Drone and multirotor rotors
PC and cooling fan blades
Pullcopter toy rotors
Boat propellers
Shrouded props with a spinner

How to use Propeller Generator by Koolm

Open the model page, sign in to MakerWorld and click Customize
Set blade count, diameter, spin direction, root size and pitch
Adjust airfoils, taper, sweep, spinner, shroud and shaft hole if needed
Generate, download and print in a strong filament such as PETG

What you'll need to print it

Filament and parts that suit what you make with Propeller Generator by Koolm.

PETG

M3 heat-set inserts

M3 screws

Bambu Lab Fastener Kit Bambu Lab
Hilitchi M3 socket head cap screw assortment kit (affiliate link) Amazon

Also handy

Digital calipers

Filament dryers and dry boxes

SUNLU FilaDryer S4 (affiliate link) Amazon
Polymaker PolyDryer (affiliate link) Amazon

Some of these are affiliate links: we may earn a small commission, at no extra cost to you. More about that

Propeller Generator by Koolm pros

Blades use real NACA 4-digit airfoils with elliptical taper, so they are meant to work, not just look right
One form covers plane props, drone rotors, fans, pullcopters and boat screws
Four example configurations with their settings listed to copy and adjust

Propeller Generator by Koolm cons

Many settings, and terms like chord fraction and centerline take some reading
Author's examples use 100% infill, supports and a raft, so expect cleanup and sanding
Non-commercial license rules out selling the props you print