This thing gives you the ability of probing your heatbed with all the benefits of an opto endswitch - like a constant switchpoint and almost zero wear-out. A minimum of moving parts and a maximum of reliability.
Workload / Time :
- About 30 min. for printing
- 20 min. for modifying the screw (can be done while printing)
- 5 min. for assembly / adjustments
= Total: ~ 35 to 60 min.
Print the probe body.
- Versions for Graupner Servo Family
- Versions for SG90 9G Micro Servo
Each type is available for mounting the arm either from top or back (reverse).
Things to buy (vitamins):
- 2x M5 nut
- 1x M5x40 screw
- 1x spring about 14mm length, 7,3 mm width (or whatever fits)
- 1x Opto endstop with TCST2103 (standard) type light barrier
Use a file to form the upper end of the screw into a flat swordlike surface (length about 10 - 12 mm).
Remove screw head from the other side and form a tip end with the file.
- Assembly :
- Slide the screw into the body (swordalike end first). Add the two nut and the spring.
- Put the sword end into the slot and move both nuts down the thread.
- Adjust the moveable length of the screw by turning the nuts.
- Fix the nuts by turning against each other.
- Attach everything to the servo by using a standard servo arm. Probably an additional small hole for the fixing screw must be drilled.