Cynthia - Bolt Action Blaster (Nerf Homemade)

Cynthia is a bolt action Nerf blaster that uses half dart Talon magazines!

Firing Demo: 

Blaster Overview: https://youtu.be/mIW0dAyOCv0

Customization Overview: https://www.youtube.com/watch?v=mZe6dWdQUs0

Assembly Video: https://youtu.be/j310YjRcwpU

Sellers

A full list of non-US sellers can be found here: https://www.stuffbysilly.com/wheretobuy

Hardware is available from these sellers:

• OutOfDarts: https://outofdarts.com/products/cynthia-hardware-kit
• SilverFoxIndustries: https://silverfoxindustries.shop/collections/new-products/products/cynthia-hardware-kit

Fully printed blasters are available from these sellers:

• OutOfDarts: https://outofdarts.com/products/cynthia-3d-parts-hardware-kit

Reviews

Videos:

• Coop772 

• Captain Xavier: https://youtu.be/w24jp0K5Wfk?si=fWUyEQeJ973HoaAR
• Boomstick Mods: https://youtu.be/WF5V2YcIIjc?si=WsV3GZjRpdS0lTr-
• ZDL (China Spec): https://youtu.be/mkXsqYBOBpE?si=tJq3lU1MIqGpPgKb
• WalcomS7: https://www.youtube.com/watch?v=UhGpRX_KlXE
• BansheeIndian: https://www.youtube.com/watch?v=CzInCRDko88

Optional Parts

There are many variant parts for Cynthia:

• Left and right handed parts (for the bolt action)
• Front Ends 
  • Cynthia text or no Cynthia text 
  • Ported and unported 
  • Side rail or no side rail 
  • Slim front end 
  • Stubby short front end
• Two grip styles
• Several trigger styles
• Thumbhole stock or no thumbhole stock
• Fully enclosed plunger tube travel space, or open plunger tube space 
  • Fully enclosed is good for people with beards, to protect yourself from hair-rippage during priming
• Tons of bolt handle options and lengths
• Locking bolt handle (for "realistic" bolt action coolness) or freely-moving bolt handle 
  • Optional ball detent makes the bolt handle clicky as well, which feels really good.
• Optional muzzle with extra bottom picatinny (for bipod mounting)
• Optional picatinny rail replacements with no picatinny, for aesthetic sleekness
• Optional front grip
• Magwell panels with or without elastic holes, respectively for use with elastic or a spring on the mag release
• etc etc

Performance:

If you don't see your combo here, this might help: Cynthia performance can be roughly approximated by using CaptainSlug's Talon Claw T4 performance estimates (in regards to barrel length and spring choice) due to similar plunger tube volume.

Print Info

Infills:

• Black: 
  • PlungerRod, PlungerCap, 100% Gyroid, 5+ walls. 
  • ThumbholeStock needs a brim. 
  • Everything else, 20% Gyroid, 5 walls.
• Orange: 
  • BoltBase, BoltHandle, FrontGripKeeper, Catch, CatchPusher, PlungerHead, 100% infill, 5 walls. 
  • BoltHandle, FrontGripKeeper, CatchPusher need brims. 
  • Everything else, 20% Gyroid, 5 walls.
• Green: 
  • MagwellBack, Magwell_L, Magwell_R, Grip_L, Grip_R, 100% infill, 5 walls. 
  • All the tall green parts benefit from a brim. 
  • To be safe, I recommend you print each tall part one at a time. 
  • Everything else, 20% Gyroid, 5 walls.

Some parts have tight tolerances (mainly the dovetails in the catch area on the top cover print). Sanding and/or filing is recommended to make the dovetails go together smoothly. The top cover part can be broken if you try and force oversized dovetails together.

Note: If your trigger has a heatset insert for the threaded rod, MAKE SURE TO USE THREAD LOCKER (after adjusting the trigger pull take-up during assembly).

Hardware

Full hardware list: https://docs.google.com/spreadsheets/d/1t6-6BqBstn1Ad-zIxsB0FqWth3nB00lHC9SVksAbSmY/edit?usp=sharing

H4 bar spec for those interested:

H4 bars can be cut down from C4 bars using the bar cutting tool (included in Cynthia files).

Assembly

Video: https://youtu.be/j310YjRcwpU

Catch assembly: https://youtu.be/D5Ouzac-vMs

Plunger Tube Gluing Guide: https://www.youtube.com/watch?v=0BNuwjhlNqI (Please use two part epoxy. Super Glue isn't as good, but it'll do in a pinch.)

Design lineage:

Cynthia began with me figuring out how to fix the issues with CaptainSlug's Indra blaster, but I pretty quickly realized it would be easier to design a whole new blaster from the ground up, rather than fix the Indra part by part (Cynthia contains no original Indra parts). Thank you Slug for paving the way to this blaster being great :)

Misc.

If you build any of my designs, I'd love to see yours! Feel free to message me on Discord (Sillybutts#5905) or tag me on a post on Reddit (u/SillyTheGamer).

Thanks to OutOfDarts, Diessell, Virus22386, BoomstickMods, Chance, and MisplacedMoose for photos.

Thanks to ThePixelatedCat for doing the blaster mechanical animation via commission.

Thanks to Medli20 for the excellent Cynthia/Cynthia art! You should go check out their stuff :)

China: 你好！ 我擁有這個設計。 想生產請聯繫我. 你好！ 我拥有这个设计。 如果你想生产，请联系我.

Disclaimer: This is not a toy. This blaster is meant for hobbyists, not children. Blaster must be operated correctly to avoid injury. I am not responsible for any injuries from this blaster. Please use a bright/blaze orange muzzle and barrel cap on this blaster. Consult local laws before building this high powered blaster.

Changelog: 

3-31-2023: Blaster release.

6-15-2024: Fixed the orientation of the boltbases being flipped around. The parts were just exported flipped the wrong way, so I've flipped them around the correct way so people can slice them easier.

Donations & Merch

If you like what I do, please consider supporting me! 

I don't charge for my files, so any donations or merch purchases would be greatly appreciated!

• Patreon (Monthly donations)
• Buy Me A Coffee (One-time donations)
• AWESOME shirts made in collab with Brandon Diaz
• RedBubble My merch shop, full of fun Nerf-y stickers and shirts!