/Cynthia

Cynthia is a bolt action blaster, similar to the Indra.

Cynthia

Cynthia is a Talon mag fed bolt action blaster, customizable for any need.

Changelog (click this text, it's a dropdown!)
  • Changelog: 3-31-2023: Blaster release.

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I ALSO UPLOAD TO PRINTABLES https://www.printables.com/model/822838-cynthia-bolt-action-blaster-nerf-homemade

Description

Cynthia is a bolt action blaster using the same basic layout as the Indra by CaptainSlug. Cynthia began with me figuring out how to fix all the issues with the Indra, 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.

Firing Demo: https://youtube.com/clip/UgkxEHjsmXU370IFB8PHDxiK1v4qDb7vdCwZ

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

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

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

Reviews

Videos:

I don't charge for my files, please consider supporting me!

If you enjoy the stuff I make, please consider donating via Patreon or BuyMeACoffee. Filament and prototyping stuff costs a lot! By donating, I can make more cool stuff for everyone to enjoy. Thanks!

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What does Cynthia fix vs the Indra?

The Indra by CaptainSlug is infamous for it's many issues. Thankfully, Cynthia fixes almost all the issues the Indra had:

  • Fixed catch reliability by using the plunger system from the SLAB (modified to be longer)
  • Improved plunger tube attachment strength (glue and more attachment area)
  • Improved ramrod retention
  • Made Cynthia slimmer
  • Lengthened the stock to be Caliburn V4 length.
  • Massively improved trigger feel
  • Made the blaster lighter
  • Less hardware cost
  • Vastly improved front half rigidity
  • A lot easier to assemble, disassemble, and swap springs.
  • The thumbhole stock is easily removable, and is not required (on the Indra, the stock rod is required for blaster rigidity)
  • Probably more stuff that I can't remember

Optional Parts

There are many variant parts for Cynthia:

  • Left and right handed parts
  • 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

Here are some good Picatinny sights if you want some:

Performance:

As testing is done, I will update this part of the page with common spring/barrel combos for specific FPS numbers.

Keep in mind that SCARs usually reduce performance a bit.

Cynthia performance can be roughly approximated by using Talon Claw T4 performance estimates (in regards to barrel length and spring choice).

Sellers

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

Hardware is available from these sellers:

Fully printed/assembled blasters are available from these sellers:

Print Info

Cynthia uses less than one 1kg PLA spool (if you were to print it all one color).

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 the dovetails together.

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 (Super glue works, epoxy is best)

Beta Tester Thanks

Thanks to my beta testers who contributed features and variant parts to Cynthia! Here's a list of who did what: (click this text)
  • Chance made a new trigger for Cynthia, fixed some trigger wobble issues, and recommended adding a ball detent to the bolt handle.

Also, thanks to all my beta testers for their feedback while designing Cynthia. Couldn't have done it (this well) without you guys(and gals)!

  • Chance
  • WonderBoy
  • BansheeIndian
  • Greg from OutOfDarts

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).

If you are having issues with any of my designs, let me know on Discord (Sillybutts#5905) or Reddit (u/SillyTheGamer).

If you wish to print and sell this item, please contact me for licensing. I can be reached on Discord (Sillybutts#5905) or Reddit (u/SillyTheGamer). iamsillybutts@gmail.com email too. 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.

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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.

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!

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Images