Hall sensor Endstop for Ender 3

thingiverse

I designed my own endstop with an A3144 hall effect sensor. It is fully compatible with the mechanical components. To make it work, we just need to add a +5V wire and replace the 2-pin connector with a 3-pin one. I installed it on the Z-axis, but other axes should work well too. The case consists of two parts: a case and a cover for it. The cover has two different designs: printed or cut on a CNC machine. I used 3.8mm thick shaded acrylic and cut it on my CNC. The *.DXF file is included to help with the cutting process. To make the board, I also used my CNC. You can manufacture it in any way you like; the gerbers and drilling files are included for reference. You can use FlatCam to create the board if you prefer. The printed cover fits very well, but unfortunately, I didn't take a picture of it. If you decide to print the cover, it's designed to fit a 3mm LED light. However, if you cut the transparent cover using your CNC, you can use either a 3mm LED or an SMD 1206. It works just like the stock mechanical endstops, which are normally closed when not triggered and tied to GND. When triggered, it's tied to +5V. Due to its long range of sensitivity (~5-6mm), some modifications are required in Marlin: Configuration_adv.h #define Z_HOME_BUMP_MM 0 This will make the endstop home once, or #define Z_HOME_BUMP_MM 6 for twice homing, as usual You can print the case using any material you like; I used HIPS. The estimated weight for the case is ~4g and ~1g of plastic for the cover. It's designed with 0.1mm tolerances, so it fits together very closely and securely. To attach it to the stock mount, we need two hidden M2x15 screws and a holder for the moving magnet on the Z-axis. Be careful - only one side of the magnet triggers the switch! All components on the board are surface-mount devices (SMD), including a 1206 capacitor and 1206 or 0805 resistors. This was just an experiment, and it works fine but has some issues. I recommend installing an LJ12A3-4-Z/BX inductive sensor instead.