3D Printed Roman Catapult (Working Onager Siege Engine)

Working Roman Onager Catapult – 3D Printable Siege Weapon (Free STL)

Build your own Roman Onager — a working, 3D printable siege weapon inspired by ancient torsion-powered artillery.
This functional catapult uses twisted cord to fire printed projectiles with surprising force — perfect for display, tabletop games, or a bit of printable mayhem.

🧱 FEATURES:

• Fully printable with standard FDM printers
• Designed for real launches using twisted cord
• Easy-to-follow assembly with included PDF instructions

🎥 See the Onager in action here: https://youtu.be/aiNMUyBC6Mo

💀 WANT SOMETHING EVEN WILDER?
Check out the Premium Skull Edition on Cults3D https://cults3d.com/:3079878
Enhanced visuals, alternate parts, and fantasy flair.

💥 Follow VogMan for more modular terrain, creative props, and 3D prints ready for any battlefield!

🎥 YouTube: @VogMan

MATERIALS
It's all in the Instructions PDF, but nothing major… PLA, a little TPU, a few M3 bolts, sleeving, strong thread, and the spring from an ordinary click-top-pen... stuff most makers have lying around.

SAFETY
Seriously, don’t fire this at anyone. It packs a punch. Hurting people, even that annoying neighbour, isn’t what this build is about. Play responsibly!
Always supervise children and pets when using the Onager, and keep fingers clear of fast-moving or pinching parts. Also, be mindful of the choking hazard associated with small parts around pets and young children.
This model is provided “as-is” without any warranty or guarantee of fitness for purpose. By downloading or printing this file, you assume all risk. The creator (VogMan) accepts no liability for injury, damage, or misuse. Models should be assembled and used with care and under supervision where applicable. Not suitable for children.

📩 REQUESTS
Got a request for a model you'd like to see made? I can’t promise I’ll get to everything, but I’m always happy to hear from folks. Follow me and drop me a message!

⚖️ LEGALITIES & USE
© VogMan, May 2025. All rights reserved.

These files are strictly for Personal Use Only.

You may:

• ✔️ Print them for yourself
• ✔️ Share photos of your printed models online (please credit VogMan)

You may NOT:

• ❌ Sell printed versions (unless licensed)
• ❌ Share, modify, or distribute the digital files
• ❌ Use these files commercially without permission

Personal Use means just for you!

💼 COMMERCIAL LICENSES
If you're a Registered VogMan Patron Commercial License holder, you may print and sell this item according to your license terms.

However:

• The STL files remain the property of VogMan
• Redistribution, resale, or remixing of digital files is not allowed under any license

📄 For more details about my commercial licensing, click here

🔗 FIND ME ONLINE

https://www.patreon.com/vegoilguy
https://www.youtube.com/@vogman
https://linktr.ee/vogman
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https://www.etsy.com/shop/VegOilGuy
http://www.vogman.co.uk

📬 CONTACT DETAILS
https://www.vegoilguy.co.uk/contact_general.php