> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Brass Heat-Set Inserts for Plastic - M3 x 3mm - 50 pack

**Type:** Product page · **SKU:** ADA4256 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/brass-heat-set-inserts-for-plastic-m3-x-3mm-50-pack.html ([markdown](https://core-electronics.com.au/brass-heat-set-inserts-for-plastic-m3-x-3mm-50-pack.html.md))

Wanna improve the connection strength between your project's 3D-printed parts, and also have nice clean surfaces? Instead of gluing bits together, or screwing plastic...

## Pricing

- **Price:** $12.15 (inc GST) — $11.05 AUD, exc GST
- **Quantity discounts:** 10+ $10.72 (exc GST) · 50+ $10.49 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 18 and Aug 24.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA4256:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ADA4256:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

Wanna improve the connection strength between your project's 3D-printed parts, and also have nice clean surfaces? Instead of gluing bits together, or screwing plastic screws directly into your 3D prints, use strong and reusable machine screws and heat-set inserts. Heat set inserts are only a few cents a piece and have a grooved outside, with theads on the inside. Originally they were designed for injection molded parts but they work fabulously for 3D printed plastic as well.

You could use a plain soldering iron to try to heat-press these in - Heat up the iron and use it to press the insert in, wait for it to cool, then use like a hex nut that's embedded inside the plastic. [**Adafruit strongly recommend Adafruit's heat-set insert tool for soldering irons** ](https://core-electronics.com.au/heat-set-insert-for-soldering-irons-4-40-m3-inserts.html)because it's really hard to insert them straight otherwise and you risk damaging your print!

[Check out this video from Noe & Pedro that shows you how to do it](https://youtu.be/AJ9JT_pHqAw?t=1944)

Comes as a 50 pack of M3-threaded inserts that are 3mm long with a 4.5mm outer diameter.

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/4/2/4256-03.jpg)