Posted on Wednesday, Jan 10th, 2018

Thank you to everyone who came out to our Blacksmithing Class last night. It was good to see so many old and new faces.

Special thanks goes to Myles, our Sergeant At Arms, who volunteered to teach the class and made the forge for us to use.

Posted on Sunday, Dec 17th, 2017

On December 9th, 2017

20 People came to Arch Reactor to learn how to get started with microcontroller programing and electronic circuits using Arduino. Chris W. taught the class and other members were on hand to assist in the learning. 

This was the first in a series, if you already know some basics keep an eye out for the next class.

At the end of this 2 hour workshop 20 more people now know what an arduino is, what it isn't, what it can and can't be used for. They also learned some electronics basics like how to read schematics, what resistors and capacitors actually do and when to use them.


Posted on Saturday, Dec 2nd, 2017

Sunday, December 3, please join us for Ornament Hacking!

A few examples of ornament designs ready for the laser printer:


Sample Ornaments for the Laser
Sample Ornaments



Posted on Wednesday, Nov 15th, 2017

At Arch Reactor we were disappointed to hear that TechShop is seeking bankruptcy protection and has closed all their locations, including their St Louis location in Cortex. We know how important being able to use TechShop's workspace and equipment was to their members, many of whom relied on those facilities to do work for their small businesses.


If you are a member of TechShop who is now looking for a new workshop, we'd like to welcome you into the Arch Reactor community! We don't have all of the equipment that TechShop had, but we do have a laser cutter, 3D printers, and a variety of woodworking and metalworking tools.



Please see our calendar for times when our space will be open and feel free to come get a tour and meet members at any event. We'll be having an Open House on Sunday, November 19 at 7:00pm, which would be a fine time for TechShop members to visit and learn more about Arch Reactor. The space is also opened at other times unscheduled. See "Space Status" on the right side of our home page to see whether the space is open at the current time.

Posted on Tuesday, Oct 3rd, 2017


Subscribe to <none>

Upcoming Events


  1. 3D Printer Meetup

Sunday, March 25th

  1. Pysanky Eggs
  2. Open Build Something!
    • Start time: 07:00pm
    • End time: 10:00pm
    • Where: 2215 Scott Ave, St. Louis, MO 63103, USA
    • Come stop by and visit! Open build night to work on projects and hang out!

    • View this event in Google Calendar

Tuesday, March 27th

  1. Pysanky Eggs
  2. Shop Training: Basic Wood Lathe

Thursday, March 29th

  1. Laser Workshop Night
    • Start time: 07:00pm
    • End time: 08:00pm
    • Where: 2215 Scott Ave, St. Louis, MO 63103, USA
    • Feel free to come by to learn how to use the laser cutter, talk about laser cutters, work on laser cutter projects, etc!

      Contact Person: Travis

    • View this event in Google Calendar

Saturday, March 31st

  1. International Open Day
    • Start time: 10:00am
    • End time: 09:00pm
    • Where: 2215 Scott Ave, St. Louis, MO 63103, USA, Archreactor, Arch Reactor
    • Arch Reactor, Just like many Hackerspaces World Wide, invite you to come in and see our Space, in celebration of International Open Day.

      Come in and see who and what we are, how you can become part of the Group or just hang out and have some fun in conversation. We will be Open from 10am until at least 9pm that day.

    • View this event in Google Calendar
  2. March BoardGame Night * ArchReactor
    • Start time: 12:00pm
    • End time: 11:30pm
    • Where: 2215 Scott Ave, St. Louis, MO 63103, USA, Archreactor, Arch Reactor
    • Come On Out and Play games With us. If you don't know games that's OK we are friendly and love to teach. If you do, bring your Favorites along and let get a Game in.

      We'll have Food there, and I'll happily take 5$ in exchange for letting you eat all day.

      We start at Noonish and Play until you Leave or after Midnight, whichever comes last. :)

    • View this event in Google Calendar

Search form

Visit Us!

Come check out the space at one of our regular Tuesday meetings or Sunday hack nights, year-round. Tuesday and Sunday events are always open to the public, and generally begin around 7:30 pm.

Space Status

The space is currently:

About Our Hackerspace

Arch Reactor was founded in 2009 by a group of friends who liked technology, programming, making, and pizza. Now St. Louis' largest hackerspace, Arch Reactor's growing membership continues to bring new skills, projects, equipment, and people to one place.

For a deeper understanding of what we're about, you should check out our explanation of hackerspaces, perhaps read about one of our members' projects, or (best of all) come meet us in person at the next open event!

You may also create a new account or log in using one of the providers below