HTProbe Bed Level Probe

thingiverse

This probe can soon be purchased from https://hightemp3d.com. It's a tough build, but don't worry if you need help - just hop on over to Discord or wait and buy it when it's available. The prototype is working amazingly well, and the best part? It's completely unaffected by magnetic fields, with only thermal expansion influencing its behavior. Plus, there are no electronic parts inside the enclosure, so this probe can handle the temperature of the 3D printed plastic and string. This build is a remix of Steve White's Marionette probe, and you'll need the following materials to get started: * M5 brass washer * Long M2 thread insert * Short M2 thread insert * M2 shoulder bolt 25 mm long * Spring - Thread diameter: 0.32 mm, Inner diameter 3.68 mm, Length 19.8 mm * 1.5 mm^2 copper wire (only a few mm needed) * Wires * Connector * Soldering iron * Solder * MG996 servo * Bowden tube * Braided fishing line or Kevlar line * Sandpaper * Steve White's servo mount for the Marionette probe. I used ABS for the two printed parts, and let me tell you - it was a real challenge. The threads were tough to get right, but I managed to print them with some strength. Here's what you need to do: * Print the two parts * Solder the two thread inserts together, making sure the small insert is on top of the long thread insert. The short insert will function as an eye for the line. * Take the 1.5 mm^2 copper wire and give it a 90-degree bend. Then solder it to the thread insert with one wire tip pointing down (away from the small insert). The tip needs to be lower than the bottom of the long insert - this is the contact point with the washer. * Solder a wire to the thread insert above the copper tip, making sure it's on the same side as the copper tip. * Solder a wire to the washer * Put the washer into the bottom part of the print with the wire facing down. * Put the spring on the shoulder bolt. * Put the shoulder bolt through the hole in the bottom part of the print * Screw the thread insert assembly to the top of the shoulder bolt. * Make sure the washer is flat against the bottom of the 3D printed bottom part. * Attach a line to the top of the pin. * Pull the line through the top part * Screw the top part and the bottom part together * Pull the line through the Bowden tube. * Push the Bowden tube into the top of the probe. * Connect the line to Steve White's Servo mount/Servo. When you're done, print with a raft and then use sandpaper to grind away the bottom part. The bottom part is conical inside, so the more you grind, the larger the hole will be. Keep grinding until the shoulder bolt drops freely when inserted from the top of the bottom part.