PSA ROCK Speed loader v2

     PSA Rock 5.7 Speedloader – V2

🚀 Update 5/6/2026: I’ve released Version 2.5 of this speedloader! 

New in V2.5: 

Improved ergonomics 

Redesigned the mag catch with better retention 

New 23-round version that loads a full mag at once. The 23-round version uses a multi-piece design so it still fits on printers like the X1C and A1 Mini. 

There’s also a compact one-piece 14-round version available. Thanks to everyone who downloaded the previous versions and shared feedback! https://makerworld.com/en/models/2766574-psa-rock-speed-loader-v2-5

Original Post:

This is Version 2 of my speedloader for the Palmetto State Armory Rock 5.7.

The original version worked well, but I wanted to improve the design to:

• Load multiple rounds at once
• Lock the magazine in place during use

So this version was redesigned from scratch with those goals in mind.

📦 Versions Available

Standard Version

• Fits printers with a build volume similar to a Bambu Lab P1S / X1
• Holds 18 rounds

A1 Mini Version

• Shortened to fit smaller printers (like the A1 Mini)
• Holds 14 rounds

🧩 Parts List (Printed)

This model consists of 4 printed parts:

1. Main Body – Holds rounds and houses all components
2. Plunger – Pushes rounds into the magazine
3. Mag Catch Pt. 1 – Interfaces with the magazine to hold it in place
4. Mag Catch Pt. 2 – External release lever for the mag catch

🔩 Hardware Required

Disclaimer: The links below are Amazon affiliate links. If you purchase through them, it helps support me at no extra cost to you.

• 1× M3x30 Screw
  https://amzn.to/4808a4t (Good set of M3 screws if you dont have any)
• 1× 0.4 × 5mm OD × 30mm Spring
  https://amzn.to/4u5zpDl

💡 Tip: You can stack two springs for a stronger mag release tension.

🛠️ Assembly Instructions

1. Test Fit Components

• Ensure the main body and plunger slide smoothly without binding
• If printed at higher speeds (e.g., Sport mode), tolerances may be tighter

2. Check Mag Catch Fit

• Insert both Mag Catch parts into their slots
• They should move freely without resistance
• Remove any leftover supports if needed
• Light filing may help if tolerances are tight

3. Prepare Threads

• Thread the M3 screw into Mag Catch Pt. 1 briefly to cut threads
• Holding the part with pliers makes this easier
• Remove the screw after threading

4. Assemble Mag Catch

• Insert the screw into Mag Catch Pt. 2
• Tighten until it begins to spin freely
• 

5. Install Spring

• Slide the spring onto the screw
• 
• Insert the assembly into the main body

6. Final Assembly

• Insert Mag Catch Pt. 1 into its slot
• Begin tightening the screw into it
• Stop when:
  • The catch feels secure
  • The spring returns the catch properly when pressed

✅ Finished!

Your speedloader is now ready to use.

I added a guide slot in the main body to help:

• Keep rounds aligned
• Make loading smoother and more consistent

🧪 Notes & Tips

• PLA works great -
• PETG also works - probably better if you are planning on leaving it in the Sun.
• ABS/ASA not yet tested

I’ve also included the STEP file if you’d like to make your own modifications.