LED Flashing 555 Timer 3D Printed Circuit

The general purpose 555 timer IC. Designed with PLA & conductive filament to rapid additive manufacture. This is fully functional! It blinks

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555 timer project
This project is for the general purpose 555 timer IC. The base is PLA (non-conductive) while the top layers are conductive (@proto-pasta). The traces are connected according to this blog

This is a fully functional circuit! It is aimed to be a learning kit to teach STEAM grades K-8

Dimensions: 30mm x 30mm x 6mm
Print time is 1 hour 30 minutes

*At 7%-8% mark, change the filament to conductive filament for a successful print.

Rapid circuit prototype with a 3D printer and conductive filament.

This project features a simple circuit designed to explain the working and use of a 555 timer IC.

The connection used is credited to this blog LED Flasher Circuit

The 555 timer was one of the first IC chips I learned to use in a project back when I attended community college. I learned to read the datasheet and create my first flashing LED! This is a good place to start for those new to electronics.

*I recommend reading the 555 timer datasheet to learn more!

Note: When the print is 7% to 8% complete, the conductive filament should follow. Here is a great Instructable for welding 3D filament Filament Fuser.

*I simply snipped off the colored PLA with a wire cutter, then guided the conductive filament into the 3D printer until the extruder accepted (grabbed) it.

555 Timer Project.stl

Print time is 1 hour 30 minutes *At 7%-8% mark, change the filament to conductive filament for a successful print.

Standard Tesselated Geometry - 352.62 kB - 07/11/2021 at 01:13


  • 1 × 3D Printer
  • 3 × Resistors SAT (selected at testing) I used 100k, and two 1k Ohms
  • 1 × Capacitor 1uF or 100uF SAT (select at testing)
  • 1 × 9 volt battery Any brand will do
  • 1 × 5mm LED I used blue. Color is optional

View all 8 components

View project log

  • 1
    Step 1

    After the print is complete the top layers of the board should have 3mm+ conductive filament.

    Pin 2 and 6 are connected. All other pin connections will need to be made manually.

    Place 555 timer onto 3D printed board and press firmly to make a strong connection. Careful not to bend the legs!

    1. Connect pin 4 and 8 together with a male to male jumper or wire. *tinned wire for optimization

    2. Connect LED ground leg to pin one.

    3. Connect R3 (1K ohm) to +itive lead of LED, and then to pin 3.

    4. Connect R1 between pin 6 and 7

    5. Connect R2 between pin 7 and 8

    6. Place C1 between pin 1 and 2 *-itive lead to pin 1 (for polarized capacitors)

    7. Note: Pin 5 will not be connected (this is also called floating)

    The last step is to power the circuit. 5V-9V is a good value to use for the power supply. Here I used a 9V battery and snap connector.

    Connect negative lead to pin 1. Connect positive lead to pin 8

    Please like, share, or comment. Find us on all social media! Check us out on Tindie

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