35 mm DIN Rail Mount – Integrated Spring Clip V1(Old Variation)
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Single-piece 35 mm DIN rail clip with an integrated spring latch, three M4 fixing points, and branded or plain options.
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Revised Version: Improved stiffness and strength as well as no need for supports for overhangs.
Compact. Practical. Ready to Mount.
This 3D-printable mount attaches an enclosure, backplate, or other project part to a 35 mm DIN rail.
The single-piece design combines a fixed rail hook with an integrated flexible latch supported by serpentine spring sections. Three countersunk M4 screws secure the mount to threaded inserts in the part being attached.
Two complete STL versions are provided: one with TD Circuits branding and one with plain branding fields.
Features
Designed for 35 mm DIN rail
Single-piece printed body
Integrated flexible latch and serpentine spring sections
Three countersunk mounting holes
M4 screw mounting into threaded inserts in the attached part
Branded and plain versions with the same mechanical geometry
Compact overall size: 70 × 40 × 8 mm
Included files
File | Version |
|---|---|
35mm Din Rail Mount-Fusion.stl | Branded, with TD and CIRCUITS lettering |
35mm Din Rail Mount.stl | Plain, with blank branding fields |
Choose and print one version. These files are alternatives, rather than separate assembly parts.
Both measure 70 mm long × 40 mm wide × 8 mm thick. The DIN rail and example backplate shown in the photos are separate from the clip models.
Hardware required
Quantity | Component | Specification |
|---|---|---|
1 | Printed mount | Either STL version |
3 | Countersunk screws | M4 × 15 mm used in the pictured build |
3 | Threaded inserts | M4 × 6 mm, installed in the part being mounted |
1 | DIN rail | Compatible 35 mm rail |
1 | Project part | Enclosure, backplate, or bracket to attach |
Minimum screw length: 10 mm. Select the length to suit the thickness of the attached part and the insert position, with adequate thread engagement and clearance.
Mounting pattern
The two holes at one end are 15 mm apart, centre to centre.
The third hole is centred across the width, 55 mm along the length from the two-hole row.
Suggested print settings
These are starting points rather than a tested print profile:
Material: PETG/PLA
Layer height: 0.20 mm
Walls: 4 perimeters
Infill: 20–30%
Orientation: Flat back on the build plate, latch and countersunk openings facing up
Supports: Inspect the slicer preview around the latch and rail hooks
The plain STL needs reorientation from its supplied position. Lay its broad flat back on the build plate.
Check that the slicer preserves the narrow spring arms and their gaps. Remove stringing and any brim or support material that could restrict latch movement.
Assembly and use
Install three M4 × 6 mm threaded inserts in the enclosure, backplate, or other part being attached.
Place the clip’s flat back against that part.
Secure it with three M4 countersunk screws. Seat the heads flush without overtightening the printed body.
Engage the fixed hook at the two-screw end over one lip of the DIN rail.
Flex the latch as needed to engage the opposite lip.
Check that both hooks are fully seated and the complete assembly is secure.
To remove the assembly, disengage the flexible latch before lifting the fixed hook clear.
Fit depends on the rail profile, material, and printer tolerances. Check the printed clip on your rail before putting the finished assembly into use.
About this design
I designed this mount to attach project parts to a 35 mm DIN rail using a compact printed clip and standard M4 hardware.
If you print one, I’d love to see what you mount with it!
Designed by TD Circuits.
Happy printing!