Precision opto probe for auto bed leveling

thingiverse

This heatbed probe allows you to effortlessly assess your heatbed with advantages similar to those of an opto endswitch, such as consistent switch point and minimal wear-out. With few moving components and high reliability, it's a winner. Estimated work hours: Approximately 35 to 60 minutes - 30 minutes for printing, 20 minutes for screw modification (can be done simultaneously), and 5 minutes for assembly and adjustments. Instructions: 1. Print the probe body. 2. Choose from versions designed for Graupner Servo Family or SG90 9G Micro Servo, available in top or back mounting (reverse). 3. Purchase essentials (vitamins): - Two M5 nuts - One M5x40 screw - One spring approximately 14mm length and 7.3mm width (adjust as needed) - One Opto endstop with TCST2103 type light barrier Preparation: 4. File the upper end of the screw into a flat, sword-like surface, about 10-12mm in length. 5. Remove the screw head from the other side and shape it into a tip end using the file. Assembly: 6. Slide the sword-end first screw into the probe body. Add the nuts and spring. 7. Insert the sword end into the slot and turn both nuts down the thread. 8. Adjust the moveable screw length by turning the nuts. 9. Secure the nuts by twisting against each other. 10. Attach the entire setup to the servo using a standard servo arm, with possible additional drilling for fixing screw hole.