---
title: Build a Custom 3D‑Printed Spacer System for Stable PCB Mounting – Complete DIY Tutorial
siteUrl: https://logzly.com/hardwarehacks
author: hardwarehacks (Hardware Hacks)
date: 2026-06-16T15:21:52.013613
tags: [hardware, diy, electronics]
url: https://logzly.com/hardwarehacks/build-a-custom-3dprinted-spacer-system-for-stable-pcb-mounting-complete-diy-tutorial
---


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Ever tried to bolt a PCB onto a metal chassis and ended up with a wobble that makes the whole thing look like a cheap robot? You’re not alone. A shaky board can cause intermittent connections, stress the solder joints, and turn a neat project into a headache. That’s why a reliable spacer system matters – it locks the board in place, keeps the heat sink clear, and lets you swap boards without a toolbox full of tiny hex keys.

Below is a step‑by‑step guide to designing, printing, and installing a set of 3D‑printed spacers and standoffs that fit any hobby‑board. I’ll walk you through the choices I made, the tools I used, and a few tricks that saved me from common pitfalls. By the end you’ll have a reusable, low‑cost system that looks as clean as a factory‑made product.

## Why 3D‑Printed Spacers?

Most kits ship with metal standoffs, but they come in fixed lengths and often require a [drill press](https://www.amazon.com/s?k=Drill+Press&tag=organizationtip101-20) to tap the holes. With a [3D printer](https://www.amazon.com/s?k=3D+printer&tag=organizationtip101-20) you get:

* **Custom height** – match the exact clearance you need for connectors, heatsinks, or cables.  
* **Integrated features** – add a snap‑fit, a cable guide, or a label directly into the part.  
* **Rapid iteration** – change the design in minutes and print a new batch without ordering [new hardware](https://www.amazon.com/s?k=new+hardware&tag=organizationtip101-20).

All you need is a decent slicer, a filament you trust, and a little CAD know‑how. If you’ve never touched CAD before, don’t worry – I’ll keep the geometry simple. If you’re unsure which standoff size works best for your Arduino or [Raspberry Pi](https://www.amazon.com/s?k=Raspberry+Pi&tag=organizationtip101-20) board, check out our guide on selecting the perfect standoff.

## [Materials and Tools](https://www.amazon.com/s?k=materials+and+tools&tag=organizationtip101-20)

| Item | Reason |
|------|--------|
| PLA or PETG filament (1.75 mm) | PLA is easy to print, PETG tolerates a bit more heat if the board runs warm. |
| FDM 3D printer (any with 0.2 mm nozzle) | Standard hobby printers work fine. |
| Free [CAD software](https://www.amazon.com/s?k=CAD+software&tag=organizationtip101-20) (Fusion 360, Tinkercad, or FreeCAD) | All have a “cylinder” primitive that’s perfect for spacers. |
| Small hex driver set (M2‑M4) | For the [screw holes](https://www.amazon.com/s?k=screw+holes&tag=organizationtip101-20) we’ll thread. |
| Tap set (optional) | If you want internal threads; otherwise use self‑tapping screws. |
| Sandpaper (200‑400 grit) | To clean up any rough edges after printing. |

## Step 1 – Measure Your Board

Grab a ruler or a [digital caliper](https://www.amazon.com/s?k=digital+caliper&tag=organizationtip101-20) and note three dimensions:

1. **Board thickness** – most PCBs are 1.6 mm, but some are thicker.  
2. **Mounting hole diameter** – typically 3 mm for M3 screws, but verify.  
3. **Desired clearance** – distance from board to chassis or heat sink.  

I measured a 2 inch by 3 inch Arduino‑compatible board: 1.6 mm thick, M3 holes, and I wanted a 10 mm gap for a [small fan](https://www.amazon.com/s?k=small+fan&tag=organizationtip101-20). Write these numbers down; they become the key parameters in the CAD model.

## Step 2 – Sketch the Spacer in CAD

Open your CAD program and start a new sketch:

1. **Create a cylinder** with a diameter of 6 mm. This gives a little extra material around the screw hole for strength.  
2. **Add a central hole** of 3 mm (or the size of your screw). Keep the wall thickness at least 1.5 mm – that’s enough to avoid cracking.  
3. **Extrude** the cylinder to the total height: board thickness + clearance + a little extra for the screw head. In my case: 1.6 mm + 10 mm + 2 mm = 13.6 mm. I rounded to 14 mm for simplicity.  
4. **Optional features** – add a small notch on the side to snap the spacer onto the board edge, or a shallow groove to hold a zip tie.  

Save the file as an STL. If you’re new to CAD, there are plenty of [YouTube tutorials](https://www.amazon.com/s?k=YouTube+Tutorials&tag=organizationtip101-20) that walk through creating a simple cylinder with a hole.

## Step 3 – Slice and Print

Load the STL into your slicer (Cura, PrusaSlicer, etc.) and set these basics:

* **Layer height:** 0.2 mm – good balance of speed and detail.  
* **Infill:** 30 % honeycomb – strong enough for the load but not wasteful.  
* **Print speed:** 50 mm/s for PLA, a bit slower for PETG.  
* **Supports:** none needed; the spacer is a solid column.  

Print a single test piece first. Check the dimensions with a caliper; if the hole is a hair too tight, you can either sand it or adjust the CAD model by 0.1 mm and reprint.

## Step 4 – Add Threads (If You Want)

If you prefer a clean, reusable thread rather than self‑tapping screws, you can tap the holes after printing:

1. **Select a tap** that matches your screw size (M3×0.5 is common).  
2. **Apply a little cutting oil** – even on PLA it helps the tap go smoothly.  
3. **Turn the tap gently** clockwise, backing off every few turns to clear chips.  

I usually skip this step for quick prototypes and just use M3 self‑tapping screws. The plastic holds them well enough for a few months of use.

## Step 5 – Install the Spacers

Now the fun part – mounting the board:

1. **Place the spacers** on the chassis where the mounting holes line up. If you printed a small lip on the bottom, it will snap into a recessed groove on the metal plate.  
2. **Insert the screws** through the board, into the spacer, and tighten just enough to hold the board flat. Over‑tightening can crack PLA, so a firm hand is enough.  
3. **Check for wobble** – the board should sit level with no play. If you see any movement, loosen the screw, adjust the spacer’s position, and retighten.  

For a detailed walkthrough of this process, consult the [step‑by‑step guide to installing spacers and standoffs](/hardwarehacks/step-by-step-guide-installing-spacers-and-standoffs-for-reliable-diy-electronics-projects).

I like to keep a spare set of spacers in my toolbox. If a board gets upgraded, I just print a new height and swap them out. No need to order new metal standoffs each time.

## Tips and Tricks

* **Use PETG for heat‑sensitive projects.** PLA softens around 60 °C, which can be an issue if you mount a power regulator that runs hot. PETG stays rigid up to about 80 °C.  
* **Add a fillet** (rounded edge) to the top of the spacer in CAD. It reduces stress concentration and makes the screw head sit more comfortably.  
* **Label the spacers** with a tiny raised number or letter. When you have multiple heights, it’s easy to pick the right one at a glance.  
* **Print a “spacer holder”** – a [small tray](https://www.amazon.com/s?k=small+tray&tag=organizationtip101-20) that keeps the printed parts organized and prevents them from rolling off the bench.  

## Real‑World Example: My First Drone Frame

When I built a DIY quadcopter, the flight controller board needed a 12 mm clearance for the prop‑guard. Off‑the‑shelf standoffs were either too short or required drilling new holes in the carbon frame. I printed a set of 12 mm spacers with a built‑in cable guide, and the whole board snapped into place without a single drill. The result? A vibration‑free flight and a frame that looks like it came from a professional kit. That little spacer saved me hours of sanding and a few extra dollars.

## Wrap‑Up

A custom 3D‑printed spacer system gives you control over board height, clearance, and aesthetics. With a few measurements, a simple CAD model, and a quick print, you can turn a wobbly prototype into a solid, professional‑looking project. The process is cheap, repeatable, and—most importantly—fun. So fire up your printer, grab some filament, and give your next PCB the stable home it deserves.