Schaffner FN2070-16-06 Inline EMI Filter

Schaffner FN2070-16-06 Inline EMI Filter Enclosure

This is apassively ventilated, honeycomb enclosure designed for theSchaffner FN2070 series inline EMI filters. It is sized specifically around theFN2070-16-06, though other FN2070 variantsmay fit —verify dimensions and bolt pattern before printing.

The enclosure uses atwo-piece design with a modular lid, allowing connector upgrades without reprinting the entire body.

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Design Details

***Lid mounting:**

• x8 × M4×12 bolts

• Recessed nut pockets in the enclosure body for secure fastening ***Filter mounting:**

• x4 × M4×12 bolts to the base

• Recessed nuts on the underside so the Schaffner is locked down tight ***Ventilation:**

• Full honeycomb pattern on all major faces

• Two internal riser pads keep the filter lifted fortrue 360° airflow ***Clearance:**

• Extra rear clearance for routing an earth conductor to the downstream socket if required

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Wiring & Assembly Notes

• Designed aroundtight internal packaging to keep the overall footprint compact
• I crimped spade leads at ~4–6" length, attached them to the connectors first, then tucked the wiring during lid installation
• It’s snug — but everything fits cleanly
• Tested using14 AWG stranded wire throughout

Strong recommendation: Usequality silicone-sheathed stranded wire. The lead exit areas are intentionally tight; cheap insulation or solid core wire will kink and fight you. Silicone wire makes installation painless.

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Supported Hardware (current lid version)

This version is designed around the following components:

***Inlet / fused switch:** https://www.mcmaster.com/5428N13/ ***Outlet:** https://www.mcmaster.com/1333N25/ ***Patch cable for downstream 3DP (optional):** https://www.mcmaster.com/71535K63/ ***Downstream device inlet (optional):** https://www.mcmaster.com/1333N53/

Why these parts?

Yes, the inlet costs real money (~$30). That’s because it’sactually UL-listed, mechanically sound, and built for mains duty.

You already spent$70+ on a Schaffner EMI filter — don’t kneecap the entire system with sketchy Amazon “UL-style” junk upstream. The sockets are cheap; the fused switch is where quality matters.

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Print Settings

***Walls:** 4+ ***Infill:** 30–40% minimum ***Material:**

• ✅PETG (recommended) — ideal balance of toughness, heat resistance, and dimensional stability
• ❌PLA (avoid) — creep over time is not acceptable here

This is a stout, load-bearing enclosure. Print it like one.

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Thermal Performance

Under sustained3D printer load (~850–1000 W peak), I verified enclosure temperatures using athermal imager.

• The enclosure remains only mildly warm to the touch
• Surface temperatures stayedlower than my Meanwell 24 V PSU under similar load conditions
• Heat dissipates evenly through the honeycomb with no localized hotspots observed

Passive ventilation is more than sufficient for this application.

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Included Models

All models arepre-oriented correctly for printing.

***Lid** Self explanatory ***Enclosure Body** Standard enclosure body ***Enclosure Body – Bridge Helper Version** Identical geometry, but with temporary bridge skins over nut pocket overhangs

• Improves bridge reliability dramatically
• Simply poke through with a bolt or drill bit before final assembly

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Safety Disclaimer (Read This)

This enclosure housesmains voltage hardware.

I am not responsible for what you do with it. Only build this if you:

• Have experience with mains wiringor
• Are willing to learn safely and responsibly

Double-check earth continuity, strain relief, and fastener torque. Electricity does not forgive.

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Modifications & Requests

Questions are welcome.

Requests foralternate lid connector layouts are absolutely on the tableif:

• The manufacturer provides CAD modelsor
• You can supply accurate measurements

A STEP filemay be released with sufficient demand — tolerances are fairly tight.

Category: Electronics