3D Printed Jart (aka Lawn Dart)

by makermichael, published

3D Printed Jart (aka Lawn Dart) by makermichael Feb 25, 2013
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Back in the 1980s there was an outdoor game called Jarts. The object of this game was to get an oversized dart to stick inside a plastic ring a set distance away. It was a fun game but not necessarily the most safe. For this reason, yard darts were banned for sale in the USA in 1988. Original Jarts are hard to find, but now you can print your own.


First off, a little advice - Don't make this if you're a moron. I'm not responsible for anything bad that may happen if you build one of these and decide not to use your brain. Also, please keep them away from anyone who's prone to accidents or injuries. Keep in mind, while Jarts (aka Lawn Darts) is a fun family game, they were banned for a reason - don't let that reason be because of you.

This file was modeled from an original Jart. I tried to get the flight charistics as close as possible to the real thing.

Tools required -
3D Printer
Exacto knife
Grinder / Dremel
3/8" wrench
Powerdrill (optional but makes life easier)

Bill of materials (for 1 dart)
10-24 x 36" threaded rod
3D Printed body / handle
2 - #10 Flat washers
20 - 3/16" x 1 1/4" Fender washers
2 - 10-24 Coarse thread nylon lock nuts
1 - 10-24 Coarse thread cap nut

Instructions -

  1. Print STL - I used an Ultimaker with .01mm layer height and 25% fill. I found it best to use a raft for stability. Use an Exacto knife to clean up the part once printed.
  2. Measure threaded rod into 12" sections.
  3. Thread on nylon lock nuts on either side of the cut line. Cutting might mess up the threads and backing the nuts off will make the threads usable. Chuck the rod into your power drill and hold it with the wrench to make things go faster.
  4. Cut rod. Held it in a vise using a paper towel to protect the threads.
  5. Take off any rough edges from the cut side with a grinder or Dremel.
  6. Thread the first nylon lock nut about 2" up, with the flat side facing the tip of the rod.
  7. Slide on the body, #10 washer, handle, another #10 washer, then thread on the capnut. Snug up the capnut with a wrench. Loctite might be a good idea too, safety frst!!
  8. Snug up the nylon locknut to take out the play. The fins should stil be allowed to spin freely.
  9. Add weights - I found that 20 fender washers was just about right. Feel free to experiment.
  10. Add the other nylon lock nut and tighten it down so there is no play in the washers.
  11. There should be about 1.5" of ground penetrating tip exposed. You probably shouldn't sharpen it..
  12. Go ouside, away from any people, pets, and anything else you care about including your personal safety, and give it a toss. With any luck it lands sticking into the ground and not into your head or body. No go make 4 more so you have a complete set!

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Anybody print these in PLA? How did they hold up?

All mine have been printed with PLA and they've held up fine. Most of the force is at the tip and unless you're throwing them on a hard surface (concrete / blacktop / gravel) you should be good to go.

You should name these "Darwin Darts" lol

definitely modding this file for fun... can add whistles to the wings so it sounds like a mortar a plastic enclosure at the tip end to hold sand add a lil battlestar galactica flair to it and maybe make one side a metal cylon head to add onto it... sharpen up and curve the wings some and possibly add a few glow in the dark painted parts for fun.... the other side make them look like fighters... this will take a while to get it right... but so fun... haven't thought of lawn darts in years ty ty

good night as I can purchase this item please contact me for email [email protected]

Are these compatible with original jarts in the sense of can I print these out and replace broken lawn darts that I have? The plastic has broken on a couple but everything else is perfect!

I bought up all of these I could, every time I saw them at a garage sale. Friggin love Jarts! I was thinking I would never see (or have) them again once they were broken/gone.

How cool is this! I couldn't have ever imagined making my own. I'll be printing some of these!


see my beer can lawn darts. much safer, besides lets face it, if you are playin Jarts, then you are mostly likely drinking anyway.

Ahh the good old days when Summers were spent blindly throwing Jarts over the fence at each other. The fence made it exciting!

Safer than throwing them over the house! (I'm not going to say I never did that..)

And now we know why they were banned ;-)