HTProbe Bed Level Probe

Last crawled date: 4 years, 2 months ago

This probe can soon be purchased from https://hightemp3d.com/
This is a challenging build. You can get help on Discord or you can wait and buy it when it is available. The prototype of the probe works amazingly well. The probe is completely unafected by magnetic fields and only thermal expansion influence it. No electronic parts inside the enclosure so this probe handles the temperature of the 3D printed plastic and the string.
This is a remix of Steve Whites Marionette probe. You will need:
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 mm2 copper wire. Only a few mm needed.
Wires
Connector
Soldering Iron
Solder
MG996 servo
Bowden tube
Braided fishing line or Kevlar line
Sand paper
Steve Whites servo mount for the Marionette probe.
I used ABS for the two printed parts. It is very challenging print, the threads are difficult to get right at the same time as the strength.
Print the two parts
Solder the two thread inserts together such that the small insert is on top of the long thread insert. The short insert functions as an eye for the line.
take the 1.5 mm2 copper wire and give it a 90 degrees 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 tip is the contact point with the washer.
Solder a wire to the thread insert above the copper tip. The wire must be exactly 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 sprint 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 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 whites Servo mount/Servo
Print with a raft and then use the sand paper to grind away the bottom part. The bottom part is conical inside so the more you grind the larger the hole. Grind until the shoulder bolt drops freely when inserted from the top of the bottom part.