CNC 3D Printer Mech Endstop Switch uses a lever switch to detect when it is activated. The switch is wired up so that when activated, it pulls the signal to LOW. There is also an LED on the board that will light up when the switch is activated. It uses a standard 4 pin 100″ pitch header and accepts a standard, old-style CD-ROM audio connector cable.

The mechanical endstop is a simple solution to a simple problem. We want to be able to detect when an X/Y/Z stage has reached its minimum or maximum. Instead of messing with flags or complicated light beam interruption, we use a mechanical switch.

If we place the switch in the path of the stage, then the stage itself will simply close the switch when it moves against it. Other than properly positioning the switch, we do not need to modify the stage at all. If you’re worried about reliability, you can sleep well at night. The switches we use are rated for 1 million operations before failure. Since we only use the switches once per print, that means you’ll be able to do one million prints before having to replace the switch

Connection description:

• Redline: connecting VCC (ramps of +)
• Black line: connecting GND (ramps of -)
• Green Line: connecting SIGNAL (ramps in s) 

The LM8UU 8 MM Linear Motion Bearing gives you very precise, safe and reliable linear motion system. Such linear motion bearings are mostly used in 3D printers and CNC(Computer Numerical Control) machines. An LM8UU 8 MM Linear Motion Bearing can provide low friction motion along a single axis, hence find a wide range of applications in DIY and robotics prototyping.

Features

1. Temperature range of use: −40°C to 270°C.
2. Dissipation power factor: ≥5 mW/℃ (static in the air).
3. 100k Ohm NTC Thermistor.
4. NTC Thin Film Thermistor Cable.
5. Max power rating: 45 mW
6. The hot time constant: ≤7 s(in the air)