CNC Tool Probe
thingiverse
This is a normally closed touch probe for your CNC milling machine. Mine is a Stepcraft 420. The contact point is a small (4mm) diameter rod that is spring loaded to keep the contacts closed until the tool presses it down which opens contact. This is not a probe to co-ordinate measurements or probing dimensions of a part, Thingiverse has lots of those too. There is a much easier "Quick and Dirty" sensor made by "kinasmith" as shown in their instructable https://www.instructables.com/Make-a-Tool-Length-sensor-for-Stepcraft-2-CNC/ Notice that theirs is normally open and they had to set the probe as active low. This is not needed for my probe which is active high.
With this file you will be able to print CNC Tool Probe with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on CNC Tool Probe.