3D Lab Tech

Voron TAP with OMRON Sensor

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Voron TAP with OMRON Sensor

** Kits now include all parts needed to build current Voron TAP R8!!!

The Voron TAP with OMRON Sensor is a nozzle-based z-probe for the Voron 2 and Trident printer designs. It is a drop-in replacement for the X carriage that includes a nozzle probe mechanism. The entire toolhead moves to trigger an optical switch, which offers many advantages over other z-probes. The kit includes everything needed to install it, such as the OptoTap PCB, rails, magnets, and hardware. The Voron Tap Kit provides extreme precision, compatibility with any build surface, high temperature reliability, and simplified probe mechanics.

Omron or Optek Sensor?

Both of these sensors provide excellent performance. The biggest difference between these 2 boards are the temp ranges they are able to operate in reliably.

Optek (OPB666N) -40C to 100C
To see full data sheet for Optek OPB666N click here

OMRON ( EE-SX398) -40C to 75C
To see full data sheet for OMRON EE-SX398 click here

This kit is for the OMRON Sensor. The Voron TAP with Optek Sensor can be found here.

The Optotap comes in two official form factors:

V1: smaller form factor, 5V only
The V1 board attempts to minimize size and cost as much as possible, at the expense of some flexibility: it can not be used as a drop-in replacement for 24V inductive sensors (24V may work initially but will damage the optical sensor, eventually.)


V2: taller form factor, 5 or 24V capable
The V2 board adds a switch-mode regulator to allow safely connecting to 24V probe headers. The regulator converts positive input voltage between >5V and 24V to 5V on-board, at the expense of some additional components and a larger PCB. Please read important information about previous versions of this board below.
This version saves some vertical room by requiring you to solder your connector wires directly to the board.
Do not connect this version to 24V! (Did we mention that it’s not 24V tolerant???) Many of the Voron toolhead PCBs in circulation send 24V to the three-pin probe header. You cannot plug this board directly in to these headers except for Hartk Stealthburner PCB!

We carry both Single board and 2 part Hartk toolhead board that support 5v at the toolhead.

Hartk Stealthburner Tool Head PCB Rev 4

Hartk Stealthburner Toolhead PCB 2 Part Rev 4


To learn more about the different Voron OptoTap versions click here.

Indicator LEDs
The revised boards (V1.3/2.4) now have two-color indicator LEDs to help assist with troubleshooting. This should hopefully help a little bit with troubleshooting. The expected behavior of the LED is:

  • Blue: Connected to power, beam not broken
  • Red: Connected to power, beam broken

When installed in the toolhead, the light should be red normally (toolhead in ‘down’ position) and blue when activated (toolhead in ‘up’) position.
I would suggest powering on the board with 5V prior to installing it to make sure everything is functioning as expected. If the indicator LED is red with nothing blocking the optical sensor beam path, there is probably a problem with the ground and signal wires — triple check!


Tap offers many advantages over other z-probes; Here are a few examples:

A well constructed Tap, when in service on a well-constructed printer, will be able to measure your Z position reliably with a precision of 0.4 μm
(0.0004 mm). This precision will help you better use and maintain your printer.

Tap can measure any securely mounted build surface. Print on Glass, Garolite, Alumina, Moon dust…it no longer matters. Textured plates are ideal for
Tap, but adhesive PEI sheets may also be used. Tap is unaffected by beds with magnetic fluctuations (note: magnets may affect the build surface Tap
is sensing, such as pulling the plate tighter over the magnet). Once Tap is setup, you should not need to recalibrate after changing nozzles or build

Tap uses light to detect movement and will never wear out. The sensor in Tap is rated to operate at 70C to 100C and will not degrade over time the
way a contact switch or inductive probe can. Even if you brought your chamber temperature to 100C, it will accurately and reliably record your printer
melting (assuming you printed in ABS). We tested dozens of printers and thousands of print hours. Hundreds of PIF quality kits were printed using
Tap. Some test printers had over 1,000,000 probe cycles to test durability.

For consistent probing temperatures, Tap uses a single ‘activate_gcode’ macro in the [probe] config. Tap is always ready to probe and requires no
docking or undocking moves.

There is no need for a separate Z end stop. Once the offset is configured, it will hold without appreciable drift. It is normal to need slightly different
offsets when switching between filament types.

With Tap installed, the nozzle and bed are protected from minor crashes (such as accidentally setting your Z to 1 mm below the build surface, or
running into a curled up print). In extreme crashes, Tap can break away completely, saving you from a hidden break elsewhere in your printer.

More information can be found here on the Voron Github page.

Full TAP kits Include:

Some kits I have were made by LDO and some were made into kits by us at 3D Lab Tech so some parts may differ such as the rails. Our kits us RobotDigg rails and LDO has their own in house rails and some screws from LDO maybe stainless steel where our screws are all black oxide. Please let us know if you prefer a specific kit. If none are mentioned then it will be at random.

Qty 1 – 440C Stainless Steel rail 50mm MGN9H with Medium Preload
Qty 4 – 6x3mm Cylinder magnet N52
Qty 11 – Heatset Inserts
Qty 3 – M3 Hex Nut
Qty 8 – M3 Washers
Qty 2 – M3 x 20 SHCS
Qty 3 – M3 x 16 SHCS
Qty 3 – M3 x 12 SHCS
Qty 1 – M3 x 6 SHCS
Qty 2 – M3 x 6 FHCS
Qty 2 – M3 x 12 BHCS
Qty 2 – M3 x 8 BHCS
Qty 10 – M3 x 6 BHCS
Qty 2 – M3x50 SHCS

Qty 1 – Optotap PCB with OMRON sensor
V2 – 5-24v kits will also include:
Qty 3 – JST-PH crimp terminals
Qty 1 – JST-PH 3 position connector

Weight.01 kg
Dimensions4 × 4 × 2 cm
OptoTap Kit

V1 – 5v OMRON – Full Kit, V1 – 5v OMRON – Only Optotap PCB, V2 – 5v / 24v OMRON – Full Kit, V2 – 5v / 24v OMRON – Only Optotap PCB


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