Summary

A 3D-printed Programmer Clip body with PCB and pogo-pin contacts. The Programmer Clip is a DIY pogo-pin clamp for in-circuit programming or debugging, replicating the function of the well known commercial clip (such as those sold on AliExpress) in open-source form. The repository at github.com/SunboX/Programmer_Clip provides the clip body model (an OpenSCAD file, parametric with default length 60 mm), a STEP model of the 60 mm clip body, and a KiCad project for the pogo-pin “needle holder” PCB. You can easily adjust the clip length by editing the OpenSCAD parameters. Like similar pogo-pin clip designs, it uses a single compression spring and standard M2 screws/nuts to hold the jaws together.

Included Files

OpenSCAD model – Parametric 3D design of the clip body. The main length parameter is set to 60 mm by default, but you can change this value and regenerate the STL.

STEP file – Solid-model export of the clip at 60 mm length, for reference or alternative CAD use.

KiCad project – Schematic and PCB layout for the pogo-pin needle holder (the board that holds the spring-loaded contacts). Edit this design to match your required number of pins or pitch.

Required Parts

Compression spring – Approximately 0.7×6×15 mm (inner Ø×outer Ø×length). A spring with 0.7-0.8 mm thickness and around 6-7 mm diameter, ~15–20 mm long is suitable.

Pogo pins – Spring-test probes, model PL75-E2 (2.54 mm pitch). Use one pin per target pad on the PCB (the KiCad footprint is laid out for 2.54 mm spacing).

M2 screws – Four ×10 mm (length) and one ×14 mm. (Flat or pan-head M2 screws are fine; hex/Allen (Inbus) style was used in testing.)

M2 nuts – Five pieces (to mate with the screws).

Assembly

Print the clip body. 3D-print the OpenSCAD model (e.g. in PLA or PETG).

Solder the pogo pins. Insert the PL75-E2 pins into the PCBs. Make sure the pins stay straight while soldering. Only solder them to one PCB, not both!

Example in use: the printed programmer clip holds pogo-pin probes against a PCB for programming. To use the clip, align it so the pogo pins land on the target pads or pins, squeeze the clip open, then release. The spring will push the pins into the pads (as shown above). Connect the ribbon cable from the PCB to your programmer. This allows a firm electrical connection without soldering pins to the board.

Notes

The OpenSCAD model is parametric: you can change the length and other variables at the top of the file to resize the clip or adapt its shape.

The KiCad PCB is fully editable: you can add or remove pads, change pad sizes, etc., to match different connectors.