Microswitch probe with magnetic attachment, primarily aimed at CoreXY 3d printers with a focus on the Voron printers, should work on other printers with the variable mount.

The objectives for this project are:

• drop in replacement for Omron TL-Q5MC2 or PL-08N2 (you don't need to replace the toolhead)
• easier and faster to build than similar probe types
  • does not require soldering
  • fixed probe dock mount (for the printers that are suported), less variables to adjust
• be able to detect all the print surfaces
• be as close to the hotend tip as possible
• highly repeatable and accurate probes
• less temperature variations
• no melting of its parts
• cheap to build

It can also be used with the new automatic Z calibration Klipper plugin to effectively calculate the Z offset from the probe and from the Z-Endstop.

The inspiration for the Klicky-Probe comes from the Annex magprobe, now renamed to Quickdraw and the Euclid probe, it uses some concepts from each of the projects.

Updated instructions provided by StefanRaatz (robbstech V2.663#9945 on Voron Discord). oc_geek and TurBoxxs were also a great help in refining and testing the CAD files. Garrettwp provided the initial revised macro files. Mental created the initial macro and one of the first magnetically attached microswitch probes.

Without them, this effort would not be in the current state, many thanks to them.

The probe accuracy output is something like this: probe accuracy results: maximum 6.430000, minimum 6.426250, range 0.003750, average 6.428750, median 6.428750, standard deviation 0.000791

There are no need for supports, recommended settings are 4 perimeters/top/bottom, 13% infill.

The probe dock is mounted on the gantry, allowing it to be used as a Z endstop if desired (I use it that way).

There are three gantry extrusion mounts possible:

• one fixed to be used on the Voron V2.4 or V1.8 AB with MGN12 or MGN9

The fixed gantry extrusion mounts have been confirmed to work on the Voron V2.4 and V1.8

Tools:

• 1.5mm Drill
• Multimeter to check for Continuity
• Super Glue
• Soldering Iron for the heat inserts

Probe BOM:

• 1x microswitch (the omron D2F-5 or D2F-5L (removing the lever) is recommended)
• 2x M2x10 mm self tapping
• 4x 6 mm x 3 mm magnets

AB mount BOM:

• 3x 6 mm x 3 mm magnets
• 2x M3x8 mm SHC Screws
• 2 x 10cm 20AWG cable to connect the Klicky-Probe to the Mircofit Terminal

Probe Dock:

• 1x 6 mm x 3 mm magnets
• 2x M3x20 mm

Fixed Dock mount:

• 2x M3 threaded insert M3x5x4
• 2x M5x10 mm
• 2x M5 t-nut or equivalent

or

variable Dock mount:

• 10x M3 threaded insert M3x5x4
• 8x M3x8 mm
• 2x M5x10 mm
• 2x M5 t-nut or equivalent

I will add more detail to this repository as we go along.

• 2x M3 threaded insert M3x5x4
• 2x M5x10 mm
• 2x M5 t-nut or equivalent

Install your heat set threaded inserts like you did within your Voron build.

Install the magnet in the Probe dock and screw it onto the Dock mount with the two M3x20mm SHC screws.

Secure the magnet with a dab of super glue.

Mount the Probe Dock to the back rail of your gantry with the two M5x10 and the two roll in nuts.

For the probe assembly you need the following parts:

• 1x microswitch (the omron D2F-5 or D2F-5L (removing the lever) is recommended)
• 2x M2x10 mm self tapping
• 4x 6 mm x 3 mm magnets
• 1.5mm Drill
• Multimeter to check for Continuity
• Super Glue

Maybe you need to clear the holes for the microswitch, a 1.5mm drill bit should work fine.

Install the microswitch so that the arrow on the probe body is pointing to the little switch.

Then take your self tapping screws and screw the microswitch in place.

You want to install the magnets in the way that the two, which are connected to the microswitch, have the same polarity The 3rd magnet should have the inverse polarity.

However there is the possibility that the magnets will demagnetize over time due to the alternating magnetic fields thay may result in a slow but sure demagnetization of the magnets, the magnets are so strong that may take a long time to show the effects of demagnetization YMMV.

There is no need for soldering, the probe microswitch connectors are press-fit on the magnets.

Don't forget to install the magnet which holds the probe to the probe dock.

Secure the magnets with some super glue.

As the last step of the probe assembly check if you have continuity between these two magnets

If you have a normally open switch, then no current should flow, so no continuity. When you press the switch you should have continuity. When you have a normally closed switch then the behavior is the other way around.

For the AB Mount assembly you need the following parts

• 3x 6 mm x 3 mm magnets
• 2 x 10cm 20AWG cable to connect the Klicky-Probe to the Mircofit Terminal
• Multimeter to check for Continuity
• Super Glue

The AB mount wires are also connected with pressure from the magnets, you can use the probe magnets as a template to insert the AB mount magnets, it is easier that way to don't insert the magnets the wrong way.

You will not lose Y travel on any configuration in the tests that were done.

It is also recommended to glue the magnets in place, superglue is good.

After everything is assembled let's check again for continuity.

For the installation you need the following parts:

• 2x M3x8 mm SHC Screws

Connect the two wires from the Klicky-Probe to the GND and Signal of the recommended Probe signal for your board, you can even leave the BAT58 that is necessary for the 24v inductive probes. Just take care to leave the +24V of the inductive probe disconnected.

You will need to add macros to klipper to be able to dock and undock the probe as necessary to do the Endstop (if necessary) and Quad Gantry Level, it is in the Klipper Macro directory.

The macro is based on a version provided by the user garrettwp on Discord, many thanks to him. I have tweaked it a lot. It is also originally based on the great Annex magnet dockable probe macros "#Originally developed by Mental, modified for better use on K-series printers by RyanG and Trails" and can be found here

Would also like to thank the Voron discord community and VoronDesign for all the work that was and still is being made to maintain the Voron ecosystem.

Download the appropriate klicky-probe.cfg and upload it to your Klipper Config folder.

Then open your printer.cfg file and add the following line before the "Macros" Section.

[include klicky-probe.cfg]

Within your printer.cfg file search for the [probe] section and change the pin assignment to the new one z:P1.28 or the ID where you connected your Klicky-Probe to. Depending on your switch you may need to add a ! to invert that pin (normally open vs. normally closed).

Within the [probe] section also adjust your probe offset to the following values.

You need to set the probe offset within your printer.cfg

There is now an arrow on the probe telling you where should the switch pole be to have the correct offset. The probe offsets are:

z_offset = 6.42

x_offset: 0

y_offset: 19.75

If you want to use the Klicky-Probe as your Z-Endstop, you need to change the endstop_pin: under the [stepper_z] section to probe:z_virtual_endstop . Just comment out the old one and add a new line endstop_pin: probe:z_virtual_endstop.

You don't need to change anything else leave it as it is, so you can easily revert back to the original setup.

One of the last things we need to do is to adjust the probe pickup position.

For this we need to home the x and y axis of our printer then attach manually the probe to the AB-Mount.

Now juggl the probe to the probe dock and move it so far to the back that the probe docks, note done the X- and Y-Positions.

Open you klicky-probe.cfg and find the #dock location section and edit the following two line

variable_docklocation_x:

variable_docklocation_y:

If you have your Dock mounted to the bed then you need to adjust the variable_docklocation_z:, too.

If you want to use the Z-Endstop switch of the Voron to calculate the Z-Offset we the new automatic Z calibration you also need to set the following, two lines, this is the Z-Endstop Location from your printer.cfg.

variable_z_endstop_x:

variable_z_endstop_y:

If you want to use your Klicky-Probe as a Z-Endstop, then you need to set the two lines to, 0.

variable_z_endstop_x: 0

variable_z_endstop_y: 0

There is a know bug within the macro which won't let you save the offset after the probe is undocked.

Probe_Calibrate Error · Issue #8 · jlas1/Klicky-Probe (github.com)

Find the PROBE_CALIBRATE section in your klicky-probe.cfgand comment out the following two lines

#Dock_Probe

#RESTORE_GCODE_STATE NAME=_original_nozzle_location MOVE=1 MOVE_SPEED={St}

Then move your printhead to the middle of your build plate and run PROBE_CALIBRATE

After the script finished the probe accuracy test it will move the print head by the offset specified within the printer.cfg

Now you need to manually remove the Klicky-Probe from the printhead and proceed as normal.

Congratulations, your done :).

Enjoy your Klicky Probe!

It is working very well, if you decide to use it, give me feedback, either here, or on discord, my discord user is JosAr#0517. This mod is also on VoronUsers repository.

By standing on the shoulders of giants, lets see if we can see further.