Optimized Nonlethal Door Stop Multitool

by ChrisMUC, published

Optimized Nonlethal Door Stop Multitool by ChrisMUC Dec 11, 2013


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Nonlethal Door Stop Multitool

  • Optimized downside to Maximize the grip performance for holding the door in place, while on the other hand smoothly slipping in under the door when placed. If you want to add more-extra-ultra grip to the downside of the door stop you can use a rubbercoating. I tried the spray-on version of Plastidip and it works really great for this purpose.
    For your information, this is what I used: http://www.plastidip.de.com/produkte/plasti-dip-flussiggummi/
    And best of it: you can remove the coating easyly if you don't like the result. Probably you can find something similar near you in some DIY store, hardware store, home improvement store or in a shop for car supplies. I found it in an electronics store.
  • Buckled upside to hold the door in a firm and secure grip.
  • Extra Big hole (~42mm diameter) with Extra smoothly rounded edges to pull it out comfortably with 2 Fingers or even with gloves.
  • Safekeeping by hanging it over the handle of the door is possible for most doors due to the Extra Big hole. So you have it at hand in a door stop / self defense emergency.
  • Easier slipping under the door even with a small gap to the floor, due to smoothly rounded tip and optimized design of the downside of the tip (reduced size of the first to teeth).
  • Suitable for ~4mm-40mm gaps without scaling. (Just a guess based of the dimensions, to be verified in experiment. Could be up to 50mm max.)
  • Wall and handle protector. Put it behind the door to avoid slamming the door against the wall. (Try it with the round end facing the door, too. Depending on the size of the handle and the character of the floor this can give better results.)
  • Windows can be kept open with it, too. (Not talking about the software.) Try to put it in the gap at the hinged side of the window.
  • Optimized for easy printing on FDM machines (i.e. Ultimaker, RepRap,...). You should be able to print it without outer support, for details see the section instructions.
  • Childsave. It is big enough that it can't be swallowed and does not have sharp edges. If you print it with the right material it is non toxic, too.
  • Portable. It is light weight and has an Extra Big hole to grab and attach to things so it is really portable. If you want to transport it with your bike, you could just hang it around the handlebar. You could also attach a string and hang it around your neck for transport. If you transport it with your car you can attach a string to the hole and hang it around your rear mirror as an ornament, too.
  • No assembly needed. It is just one piece so you don't have to worry about a difficult and time consuming assembly. It is usable right off the printbed.
  • Customizable. You can add some rubber coating to the downside to adjust the grip needed to the floor and door you want to use.
  • Nonlethal self defense tool. Hold it with two fingers in the Extra Big hole and just think about it. If you know what a tactical pen is, you know what I mean. Probably this is the first tool you have at hand when the Zombies try to rush into your home... Update: I thought about it again and probably this is not such a good idea, because the Nonlethal Door Stop Multitool is nonlethal and the Zombies are already dead. Seems not to match. You could instead try to impress them with your printing abilities and try to involve them into some kind of communication about it. (It is even more probable that a Zombie will communicate with you about 3D-printing than the Nonlethal Door Stop Multitool will do any serious harm to him or her...) Caution: Update: As Gyrobot mentiond in the comment, there is a chance that the Optimised Nonlethal Door Stop Multitool could be lethal, too. You could bore someone to death with it. I wonder if this could work with the Zombie issue mentiond above....
  • You can use it as an ornament by hanging it around your neck. The rappers hung alarm clocks around their neck in the '80s, so why not?
  • You can use it to build a trap. Remove the handle of the door on the inner side, hold the door open with the door stop, attach a tripwire to the door stop. When somebody enters the room they release the door by the tripwire and the door closes. Works best with self-closing doors...
  • Use it as communication enabler. Just put it on your desk at work. Somebody will ask what it is. And whoosh, you are right in the middle of a 3d-printing discussion. Don't forget to print the Thing Tag. Just in case you are asked... http://www.thingiverse.com/thing:200571/attribution_card
  • Use it to test your 3d-printer. The Door stop is pretty easy to print, so the frustration factor should be minimal. And after printing you have something useful to play around with. And even if the print is not fully completed, it will probably work to stop a door. And failed prints tend to attract people, who ask you about it. A perfect print is good, but to induce communication a failed print is far better.
  • Use it as door stop this is what it is intended to be. And it works pretty well for this purpose.
  • Probably no one here reads so much text, so it seems not to matter so much what else I write here about the mere unlimited possibilities you have with this piece of plastics. But if you have more ideas about how to use this tool, you are invited to post a comment.


Thank you for visiting!



I printed the door stop with these settings:

  • 0,1mm layer (to produce a nice surface and to make it more stable.)
  • 1mm walls (to make it strong enough to really stop a door.)
  • 20% infill (If you don't use any infill the part will probably work afterwards, but the top surface could have problems because of the bridging needed. There is no extreme bridging, so it could work. I printed it with infill to make it stronger,too.)
    With these settings and a speed of 50mm/s it consumed 4h 15m of printing time.

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Zombies tend to shuffle their feet, so your trap idea with the tripwire could be very good. Zombies can be herded into different rooms by deploying bait (annoying neighbors, inlaws, and such) and arranging the doorstop in such a way that the zombies shut themselves in the room. A delay on the self-closing door would be ideal, so maybe combine this with a motion sensor -- it can't close in the normal no-motion state because of the stopper, but once the zombies trigger the doorstop and fully enter the room (however many there are), the motion sensor ceases to detect motion at the door and closes them into the room. Nice way to sort zombies, I think.

Excellent part! I thought it was going to be a little wide, but it works great and turned out even better in TPU!

in TPU where is the zombie self defence


I suspect this could be quite lethal in the hands of a properly trained lunatic. I feel loony enough! I would like to challenge you to a doorstop duel... to the death.. or to the tired. whichever comes first ;)

Snarkyness aside, I absolutely loved your description and the title caught my attention enough to go read it ;)


About to print it, but I first must let you know how much I appreciated your thoroughly entertaining and enjoyable description of the various uses for this doorstopper.

Will post up the finished product.

I don't know what happens to my formatting all the time.
I do proper formatting and some weeks later the text is still there but the formatting is not displayed anymore as intended.
Then I try to repair it and it doesn't work. Some time later I try to repair the formatting and from one monent to the other everything is formatted correctly again.
At the monent the formatting seems to work correctly again.

Does anyone have the same problem with the formatting?

How do you type like that?

So that's what my descriptions look like before editing...

I love your description, but please add some paragraphs. It's extremely difficult to read.

This is the best door stop I have ever printed! It works exceptionally well on all kinds of doors and is not like the typical rubber doorstop you would buy from a hardware store - it's much better than that. Great job ChrisMUC!!

Bribed my college English professor with it (was always complaining he wished he had a "good" doorstop). Thanks again for the grade boost and preventing the door from hitting my ass on the way out.

Thank you very much for your comment. You made my day!

For the formatting of the text you could start with this:

  • When writing the description you get a dash when you put a dash (ok, that's easy)
    but you get a bullet when the preceeding line is left empty by just using the return character and writing nothing else in this line. (a big difference for literally 'nothing' in the line...)
  • If you want to emphasize something you put one or two underline (lower dash) characters at the beginning (not separated with a space character) and at the end (again without space character) of the words you want to emphasize. (double underline: with space / without space )
    The formatting used here is called markdown. You can find details here:
    http://daringfireball.net/projects/markdown/basics (This is the Link you find on top of the preview side of the text when editing a description of a thing, too.)

  • dash with preceeding empty line (just for the show. ;-) )

Happy constructing and printing!

P.S. The comment-window doesn't use markdown, so it should be possible to copy-paste the example in the edit-thing-text-box to see the results. :-)

Lmao. I found a remix of this and was perplexed by the "non-lethal" aspect of it and then I realized I should be annoying you instead of the guy who remixed it. Your description is HILLARIOUS. Totally get what you mean by making it more "tactical pen-like" than that other karambit looking door stop. This gave me a good laugh today. I like to make my descriptions funny, but this is much better. I need to learn how to put bullets and bold fonts etc. in my description. Is it just HTML or something?

I might just end up printing this, I like the endless uses. Looks like a pretty sexy doorstop too, not really much of anything I'd change.

Thank you for your comments!
Yes, you are right, Steve. I missed that point. Perhaps it's not completeley nonlethal, if you can bore someone to death with it. ;-)
I will add that point to the description.

Phew, none lethal? death by extended yawn ;-)

This is the most exhaustive description I have ever seen!