June 6, 2025
Description
The PK-Knight is a high-performance, open-source springer developed with competitive foam dart play in mind. It was designed and tested for more than a year — including 3 complete redesigns and beta testing by experienced players — and it’s finally here.
The platform is entirely metric-based and easy to print, making it ideal for players and builders across Central Europe. Our goal is to grow the competitive hobby in the region by making truly capable hardware accessible to everyone — no imports, no weird screws, no expensive entry points.
The Knight platform has two variants. Click here for the shorter version.
The Knight-L is the longer higher-powered version of the Knight platform, which unfortunately cannot be printed on mini-sized printers (215 required Z height). It's tuned for indoor games with FPS limits in the 200–300 range. Despite its light weight and low profile, it maintains excellent performance, accuracy, and durability — all with a smooth, easy prime.
The full and detailed manual guides you through the printing and build with easy to understand steps and illustration. It also includes BOMs and drawings of the custom parts — making it easy to build from scratch or source your own hardware.
Save time and avoid part-hunting. Buy a HW kit by choosing a vendor from the table below to get you printing and blasting faster. Each kit bought supports our work, thank you!
| List of official Printkeep! kit vendors | |||
| Vendor | HW kits | Full kits | Shipping |
| Printkeepblasters.eu (us) | ✔ | ❌ | Select EU countries |
| Capital3D.au | ✔ | ✔ | Australia |
We are looking for more vendors, contact us if you wish to become one.
All parts are designed for easy printing, with clean overhangs and proper orientation. Only two parts require minimal support — the rest prints cleanly on all common setups.
With modular construction, flat aluminum bars, and straightforward fasteners, assembly is intuitive even for first-time builders.
Separate the blaster in seconds — no pins, no tools. Just loosen one thumbscrew and press two buttons. Perfect for transport, spring swaps, or quick servicing.
The barrel attaches with two thumbscrews and locks in at six points for perfect alignment. It’s fast to change and keeps your accuracy consistent.
The prime block rides on four metal bearings and 2 CNC rollers for smooth, low-resistance motion. A magnetic front catch prevents accidental double-priming during movement. The system is well-constrained, providing high performance with low effort.
The magwell is tuned for Worker straight Talons. You can eject with either hand — offhand thumb or trigger finger — and mags drop free without sticking.
The open chamber cutout lets you top-load darts directly without a mag. It also makes the magazine’s status clearly visible while playing.
A spline-optimized airpath and a spring guide with thrust bearing keeps FPS stable and efficiency high. Expect a low standard deviation, even with higher-cap springs.
The frame is clamped together using tensioned aluminum bars and dowel pins. It feels solid in-hand, but remains light and nimble thanks to skeletonized parts and smart internal layout.
The internals are tightly packed to keep the body compact and ergonomic. The full-length Picatinny rail is rigidly mounted to the frame for precise optic alignment and high accuracy.
| Stock Performance | 250 FPS (1g Worker darts) |
| Plunger Volume | 122 cm³ |
| Blaster Length | 677 mm (no barrel) |
| Length of Pull | 330 mm |
| Total Weight | <1.4 kg |
| Filament Needed | ~750g PLA + ~200g PETG |
| Can be upgraded to | 200 / 300 FPS (kits coming soon) |
We are PrintKeep! blasters, a small blaster store based in the Czech Republic. Our biggest goal is to make the hobby popular here in central Europe, which we plan to do by our metric based blaster designs, organizing events and making content. Help us by sharing our work!
All our blasters are free to download, remix, and build — and we're always working on ways to make high-performance builds easier to source, especially in countries where getting parts has been a barrier.
You can support us by shopping in our store or supporting us directly by buying us a coffee:
Buymeacoffee.com
Your support helps us create more projects for you, thank you!
License:
Creative Commons — Attribution — Noncommercial
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