Optical Bed Leveling Probe Housing for 3D Printer

Description

This model is a housing for an optical bed leveling probe, designed for DIY probe assemblies.
The housing is intended for use with a solenoid and an optical sensor and is aimed at users who design, assemble, and configure such devices themselves.

Compatibility

Important:
This housing does not replicate the electrical connection, dimensions, or mounting method of any commercial bed leveling probes.

Compatibility with a specific 3D printer, toolhead, and controller must be ensured by the user.

Design

• Single STL file

• Designed to accommodate:

  • a 10 mm diameter solenoid

  • an optical sensor

Printing

Printing parameters are not fixed.
The user is expected to choose material and print settings based on operating conditions and personal experience.

Assembly

Required components:

• 2 × M3×10 screws

• 10 mm diameter solenoid

• optical sensor

Solenoid Connection

In my implementation, the solenoid is connected to the second heater output on the controller board, using the board’s built-in power MOSFET.

Since the printer operates at 24 V and the selected solenoid is rated for 7–12 V, the voltage is limited using PWM control in the configuration.

This approach allows:

• using standard controller outputs without additional hardware

• adjusting the solenoid force via PWM duty cycle

Note on heating:
When energized for extended periods, the solenoid may heat up significantly.
It is recommended to:

• minimize activation time

• tune the PWM duty cycle carefully

• consider thermal effects on nearby plastic parts

Alternative connection option

The solenoid can also be connected instead of a controllable fan output.

When using this method, the user must:

• verify the solenoid current

• ensure the fan MOSFET on the controller board is rated for this load

• consider solenoid heating during prolonged activation

The exact wiring and control method depend on the controller board and remain the user’s responsibility.

Notes

• This model is intended for DIY projects

• Basic knowledge of 3D printing, electronics, and firmware configuration is required

• The author is not responsible for improper assembly, wiring, or configuration

Reference Components

Images of the solenoid and optical sensor are provided as examples of compatible components only.
The final selection of components and wiring method is up to the user.