LF1 - Foam Dart Blaster (NERF Compatible)

by Landru, published

LF1 - Foam Dart Blaster (NERF Compatible) by Landru May 8, 2012

Featured Thing!


Don't get left behind in the printable NERF arms race! Print this state-of-the-art dart blaster today, and show your coworkers and children you mean business.

The LF1 has a flat range of close to 50ft, and is a very solid addition to anyone's office arsenal.

Printed on a Fablicator using KISSlicer.


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Hi! I'm new to 3D printing, and CAD, but I want to make things like your Nerf gun. What program did you use to create the blaster?

It went together pretty well, I had a little trouble with getting the trigger to operate smoothly but a little sanding took care of that.

It was also a little difficult to get the two halves of the housing together once the catch spring was installed, I would think about moving the features from one half of the housing over to the other so you don't have to try and press the spring down while closing the two halves together.

I woul
d also like to add one more screw in the middle of the top of the blaster to close that up more.

Other than that they are great!

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Print a copy of each part except for the piston rod. Only one rod is necessary, and should be chosen based upon the desired power of the blaster (high, mid)

The piston and piston rod should ideally be printed in ABS due to high impact loading, and the catch should be printed in PLA to improve friction and wear. The other parts can be made from either material, though ABS generally works better with support material.

The blaster shells, piston rod, piston head, and catch should all be at 100% density. The trigger and barrel can be printed with sparse infill and 2-3 loops.

Total print time is around 12 hours.

Most of the printed pieces need some amount of support material. With good settings, it can be easily removed with a pointy pliers, razor blade (careful!) and some sand paper.

Non-printed Components:

Most of these parts come in multiples from mcmaster. One pack of each appears sufficient to make 6 blasters)

Qty, McMaster part number, description

(1) 9657K434
Primary Spring 3" long, .660 OD, .062" wire
(9657K428 or 9657K432 can likely be substituted for a less powerful and more child friendly blaster, though this is currently untested)

(1) 9657K51
Catch Spring 1.375 Long, .187 OD, .02" wire

(1) 9657K51
Trigger Spring (same as catch, cut to .75in long)

(8) 90380A110
1/2in long #4-20 plastic screws

(1) 9452K26
#114 Buna-N O-ring

(1) 1378K31
PTFE Grease (or similar)

(1) 48925K92
3/4" Sch 40 PVC 4in long

Assemble as per the pictures, and try not to let the springs fly across the room during assembly. The o-ring and piston will need to be lubricated.

Do NOT fire the blaster without the barrel fully installed. Without it, the piston rod can impact the rear of the blaster, causing mayhem.

Foam darts will need to be acquired. Nearly every toy store has them, and usually under the brand name NERF. Velcro or suction cup darts are highly recommended.

SAFETY NOTE: Do not fire darts at people's faces. This blaster can be substantially more powerful than the store bought NERF blasters.

SECOND SAFETY NOTE: The LF1 has no mechanism preventing non-foam items from being propelled from the barrel at high speed. Therefore, it's not a good idea to give this to a 5 year old.


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Pizzapie500 on Jul 15, 2012 said:

Hi! I'm new to 3D printing, and CAD, but I want to make things like your Nerf gun. What program did you use to create the blaster?

Landru on Oct 15, 2012 said:


ozchrisb on Jun 8, 2012 said:

Will this be the Thing that forces me to upgrade from my TOM and get a Replicator? Or build a Reprap with a bigger platform? Want!

MatthewLaBerge on Jun 2, 2012 said:

Great design, I'm building one right now and can't wait to finish it.

BTW does anyone have any videos of this blaster shooting?

MatthewLaBerge on Jun 8, 2012 said:

I'm printing four of these blasters and just finished one yesterday. This thing delivers on the advertised range, it also delivers a very satisfying pop when fired. I shot this five second movie of the blaster firing a whistle tip dart at my office.


scotta3d on May 30, 2012 said:

Awesome model. Here's an online 3D view for anyone without SolidWorks that wants to view the assembly...


(click for 3D View)

ckchavez on May 16, 2012 said:

Hi Landru -Awesome design, Thank you! I printed on my Replicator and all worked perfect! Except regarding the 4" PVC pipe - I had to use 3/4" PVC Sched 40. The Inside Diameter measures approximately .814" or 20.69mm - this fits the Piston and and O-Ring assembly. Did I miss something or is the Mcmaster part possibly listed incorrectly? The mcmaster part comes up as 1 1/4" Pipe Size - 5 ft. Length with an Inside Diameter of 1.360" 370psi 48925K94 ?

I just want to make sure that others get the right PVC piece.

Landru on May 16, 2012 said:

Sounds like I messed it up. Will be fixed asap.

Pointedstick on May 12, 2012 said:

Having the trigger directly manipulate the sear like that is very clever.

OpenBuilds on May 11, 2012 said:

Well done! Thank you for sharing

Lochemage on May 9, 2012 said:

How does KISSlicer compare to other slicers (Skeinforge, Slic3r)? Are you using the pro version?

Landru on May 9, 2012 said:

It is better in almost every single way. I am using the PRO version (which lets you put different parts on a tray and use multiple extruders) though the free version is plenty capable for most users.

It's also being improved on a daily basis, and the GUI will be overhauled soon to make it even simpler to get started.