Genmitsu 3018 Pro E-Stop Mount

Note: This is just one of many easy enhancements I have posted for the Genmitsu 3018 Pro CNC Router. None of my enhancements require any modifications to the stock hardware. Just bolt them on and go. If you look under my postings you'll see others including the Cable Chain, X,Y & Z Limit Switches, Vacuum Adapter, Cushion Feet, Clamping Set, E-Stop Mount and more.

An E-Stop is a very useful piece to add - especially when your first starting out with CNC. It allows you to quickly halt the process when things don't go as planned.

For this you will need to purchase the E-Stop button which you can find on Amazon as item number B0834SV7F9. You will also need a 1/4-20 x 1/2" bolt and nut from your local hardware store.

Important Note: The switch is actually made for a different machine. If you look at the bottom of the switch closely you will notice the terminals are labelled “C”, “NO” and “NC”.  To make the switch work on the 3018 Pro you will need to move the wire from the “NC” terminal to the “NO” terminal. This should be an easy unsolder and resolder.

To mount the bracket to the back of the top rail I use a modified 1/4-20 x 1/2" bolt. These are inexpensive and can be found at your local hardware store. I then use a cutoff wheel, hand grinder or grinding wheel to cut off 2 opposite sides of the bolt head. I also trim the top of the head to make it thinner. What is left is a 1/2" bolt with "ears" on the top. These ears easily drop down into the track of the top rail and once secured with a nut they turn a little and lock it in place. There are commercial solutions out there that can do this as well but I prefer something simple using what I have laying around.

The bracket was 3D printed using PETG filament with 15% infill and no supports. It probably doesn't matter what filament is used but I find that PLA tends to melt and malform sometimes with temperatures and ABS can be a little brittle when trying to snap the chain links together.

Also I design everything in OpenSCAD which is a free CAD program. I have included all of the source files I made which you can modify as you'd like.

To mount secure the switch into the bracket and then bolt the bracket to the back of the top rail with the switch on the right side of the printer.