---
title: "3030 Quarter-Round End Cap"
description: "3030 Quarter-Round End Cap is a 3D printable model by Markwatling on the SpeakCAD marketplace, 30 × 30 × 13 mm: STL and 3MF, free, editable with AI in the browser before you print it."
canonical: https://speakcad.com/marketplace/3030-quarter-round-end-cap-6f8e2b
published: 2026-10-18
updated: 2026-10-18
publisher: SpeakCAD
---

# 3030 Quarter-Round End Cap

> 3030 Quarter-Round End Cap is a 3D printable model by Markwatling on the SpeakCAD marketplace, 30 × 30 × 13 mm: STL and 3MF, free, editable with AI in the browser before you print it.

## About this model

End cap for 3030 quarter-round aluminium extrusion. The cap plate is 30 mm × 30 mm with a 3 mm thick base, featuring a centre pin (Ø7.4 mm, 10 mm long) and two slot keys (8 mm × 3 mm) that lock into the profile grooves for secure alignment. Print with the outer face down; no supports needed.

## Facts

- Category: Other
- Maker: Markwatling
- Size: 30 × 30 × 13 mm
- Volume: 3.2 cm³
- Formats: STL, 3MF (G-code sliced for 380+ printers in the editor)
- Price: free
- Editable: yes, change any dimension with the AI or by typing a number in the viewer before printing
- Licence: personal use; Markwatling keeps ownership of the design
- Tags: 3030, 8020, 30mm, aluminium, extrusion, end, cap, round

## Get it

- Get it in SpeakCAD: https://app.speakcad.com/market/3030-quarter-round-end-cap-6f8e2b
- No printer? Order it printed and delivered: https://app.speakcad.com/print?listing=3030-quarter-round-end-cap-6f8e2b
- More models: https://speakcad.com/marketplace?category=other

## About SpeakCAD

SpeakCAD is the most intuitive CAD for 3D printing, made for people who own a 3D printer and need a part that fits something they have: tap a face and type a size to shape it with simple tools, or describe it to the AI, on your phone or computer, and download a print-ready STL, 3MF or G-code sliced for your printer.

SpeakCAD works inside ChatGPT and Claude as a plugin (an MCP server): ask the assistant for a part with its measurements and SpeakCAD's own CAD AI designs it, shows it in 3D in the chat and hands over a print-ready STL, 3MF or G-code sliced for your printer.

- Live demo, no account: https://speakcad.com/demo
- In ChatGPT, Claude and other MCP clients: https://speakcad.com/chatgpt-plugin, https://speakcad.com/claude-connector, https://speakcad.com/mcp-server
- Pricing: https://speakcad.com/pricing
- FAQ: https://speakcad.com/faq
- Site index for AI assistants: https://speakcad.com/llms.txt