Introduction: An Introduction to P-R-P. 'Poor Man's Rapid Prototyping'. Let's Build an IRobot Keyring.

Picture of An Introduction to P-R-P. 'Poor Man's Rapid Prototyping'. Let's Build an IRobot Keyring.

This is a tribute.
A Thank you.
Dedicated to all people who selflessly experimented, tried, failed and succeeded. They who created instructables so other people may learn and gain by it.
And a thank you for creating a place to make all this possible;
This instructable therefore is for instructors and modders, builders and fixers.

You will find it helpful in many situations I trust.

I have used this methods and materials, described inhere for many years to fix, build, mod and stick things. Many-a-time getting me out of troublesome situations.
When you break something that has to be right. Now.
This is what you do...

Step 1: Main Ingredients, Equipment and Safety

Picture of Main Ingredients, Equipment and Safety

This took me the whole day, but then again. I am not a hurried person.

The main ingredients is this;

Aka Super glue.

Sodium hydrogen carbonate.
Aka Baking soda, bicarbonate of soda, sodium bicarbonate.

Secondary stuff you need for this instructable directly.

Key ring.
Cheap pins X2.
Some newspapers.
Printed Irobot.
File/grinder/bench grinder or dremmel.

Things you will probably need.
Things you will probably lose.


a Fan blowing lightly on you, from behind
and work outside if possible.
a Leather apron is recommended.
Try and avoid denim jeans or bare skin work.

The glue reacts with the powder making very nasty invisible fumes that should be avoided at all costs.
Noses and eyes are very sensitive to it.
You will make the mistake only once.
When super glue touch denims or overalls, it becomes scorching hot, smoking sometimes even.
It will also melt into your skin when combined with denims.

Step 2: R U Baboon?

Picture of R U Baboon?

This is all hypothetical.

None of this should be tried at all.

Step 3: Gather Them Thingy's

Picture of Gather Them Thingy's

Read the entire instructable.
Gather wits, items, courage.
Then only, shall you proceed.

Step 4: First Layer

Picture of First Layer

Add a nice thin layer Bicarbonate of soda. (henceforth to be referred to as powder.)
Flatten it with the credit card.

Step 5: Glue It

Picture of Glue It

From one side add drops of glue, saturating the powder.

Step 6: Second Layer

Picture of Second Layer

Start adding next layer asap.
The idea is to sprinkle powder over the still slightly wet glue. It will absorb the rest of the glue and continue to build up.
Keep sprinkling until it looks dry, Take care not to heap it up to thick.
This is also the start of the next layer.

Step 7: Continue Buildup Until Nice and Thick

Picture of Continue Buildup Until Nice and Thick

Continue building it up for thickness and integrity.

Step 8: Cut It Out

Picture of Cut It Out

File/grind whatever.
Make it smaller.

Step 9: Build Up Some More

Picture of Build Up Some More

Use paper pieces to build the sides up nicely.

Step 10: Make It Flat

Picture of Make It Flat

Start grinding or sanding it flat to show imperfections.
Build up the imperfections and flatten it again.

Step 11: Add the Key Ring

Picture of Add the Key Ring

First, tape the ring with the plastic or masking tape. Its so to glue don't stick to the ring. It must be able to rotate to work nicely.

Step 12: Some Detailing

Picture of Some Detailing

Add detailing where it must be built up some more.
Flatten back side with ring.

Step 13: Continue Builtup of Detailing

Picture of Continue Builtup of Detailing

Add the antennae.

Step 14: Build Up; Build Up; Build Up.

Picture of Build Up; Build Up; Build Up.

Build it up some more.

Step 15: Detailing and Refining

Picture of Detailing and Refining

Add detailing, use a dremmel and start working out the detailing and finer points.

Step 16: Detailing; Detailing; Detailing

Picture of Detailing; Detailing; Detailing

Put the rest of the details in, and cut it with dremmel.
Can use dremmel to carve out relief and add extra detail.

Step 17: Splash Some Paint on That Thingy

Picture of Splash Some Paint on That Thingy

Paint it and your done!

One good quality, acrylic / heavy plastic feel-alike Key holder.

This stuff works wonders to fix things, fill holes and more.

Can be filed to high quality finish.
The thinner you build layers, the higher quality item you get.
Its stronger then you would think.



audreyobscura (author)2013-12-23

AWESOME! I had no idea about this technique! So cool, thank you so much for sharing it, and the robot came out great!

Paige Russell (author)2015-01-19

This is rad.

Ironwave (author)Paige Russell2015-01-22

Thank you Paige.
Its some awesome stuff, I fix just about anything with it.
Its strong, hard, and quick.
Fill up random holes, done.
Fix a chip in something, check.
Fix something to anything else, Yup.
And you can be creative too!

Fikjast Scott (author)2014-02-16

Great job - I really like the process and idea

Ironwave (author)Fikjast Scott2014-02-23

Thank you very much Fikjast Scott

DJ_Pitachu (author)2014-01-15

South Africa represent!

marcellahella (author)2013-12-30

Wow, this is really cool! I never see it done before, voted!

Ironwave (author)marcellahella2013-12-30

Thank you very much Marcellahella.

marhar (author)2013-12-29

Nicely done, thanks for sharing!

Ironwave (author)marhar2013-12-29

Thank you.
Its a pleasure.

Edgar (author)2013-12-25

Did you notice that this Baking Powder and Super Glue technique will bring Powder 3D Printing to Makerbot class Printers?

Ironwave (author)Edgar2013-12-28

Could you please elaborate?
I have no clue what you are talking about.

Edgar (author)Ironwave2013-12-28

See this, specially from 2:12

ArticAkita (author)2013-12-25

WOW! baking soda & superglue? who knew but VERY neat & useful & Merry Christmas to EVERYBODY!!! *

ArticAkita (author)ArticAkita2013-12-25

Oh a tiny little question I have to what happends if it gets wet? does the baking soda kinda disintergrate & weaken the superglue without sealing it up first?

Ironwave (author)ArticAkita2013-12-25

Hi. Thanks.
Merry xmas to thee too.

I find your question a bit unclear.
If you are finished with the item, water won't affect it much.
I won't let it lay in water for example, or put it in the dish washer.
Chanses is it won't be dammaged at all.
Its been a long time since I experimented with it, but I had a bad experience once and just avoided water after it.

MTJimL (author)2013-12-24

Incredible 'Ible. I really must remember/experiment with your technique. Thanks.

Ironwave (author)MTJimL2013-12-24

Please do :-)
Thank you.
Pleasure and a wonderfull day for you and yours.
Happy Xmas.

Edgar (author)2013-12-24

Great, now name the thing, Acryoo? :)
You guys deserve a Christmas Card, here it is:

Ironwave (author)Edgar2013-12-24

Thank you.
And the same to you.
Its a huge plessure.

Edgar (author)Edgar2013-12-24

I'll do it again...

xarlock667 (author)2013-12-24

Pretty damn kewl! You out-did yourself! I will totally put this to use in the immediate future. As in a few hours from now. TY.

Ironwave (author)xarlock6672013-12-24

You can NOT say I out-did myself. You don't know how I do things at all :-D
Jokes aside, Thank you very much for the kind comment.

I will post some more pics off things I have done with this stuff later on if time permits, and people are interested.

MTJimL (author)Ironwave2013-12-24

This people is definitely interested.

Ironwave (author)xarlock6672013-12-24

Pleasure, also.

Ironwave (author)2013-12-24


MossdaleMakerspace (author)2013-12-24

Wow! We had just come across the trick of combining baking soda with CA glue the other day on YouTube, but you just took it TO A WHOLE NEW LEVEL! Now, it's time to find a good bulk supplier of CA glue. Thanks!

I find bigger tubs at places that sell o-rings and car parts.
Hope it helps.

Thank you very much!

Thanks, we'll check it out. in case you or anyone else is interested, this has inspired us to combine this method with 3d printing technology. You can read more about our idea here on the forums

First, Thanks for linking me :-)
Next, off the top of my head, there are quite a few things that makes it unpredictable.
Its better to spread glue first, and then add the powder. it gives more constant results.
The head of your printer needs to be really close to the work piece for precession. This is problematic, as the powder dries instantly, and tends to stick to anything near enough.
One need to always add more powder to dry the item faster, and keep it the residual glue in control, otherwise it rolls off and glue to parts one don't want.
its a sticky situation to say the least. Ill follow your link closely. Its a novel idea.

Ironwave (author)Ironwave2013-12-24

Ps, The coolest kind of glue is flexible, and can mend rubbers like o rings.
The kind I gets don't stick so much to fingers, and stick more to the stuff its supposed to.
When one need to break a super glue connection; try and twist it of, rather then pull. I have found it d
on't like water also. So keep glued stuff away from very wet places.

RobBBorger (author)2013-12-24

Okay, this is very cool, but I'm curious about how many tubes of glue this took?

Ironwave (author)RobBBorger2013-12-24

Sure thing.
Check out that glue in step 3 picture.
I had a quart of an older bottle, used that up, and then opened a new.
Used about a quart to a half of the new one also.
I can't find the stupid bottle right now to check it :-p
All in all, its still cheap.
The bi-carb is silly cheap and one do a lot with one box.
At about 1usd or less to about 4 usd a bottle of 20 grams, depending on where I buy.
No idea what this stuff is priced at where-ever you are.
Buy small amount first, I have found that a small amount of brands don't work with bi-carb...

Ironwave (author)Ironwave2013-12-24

And thank you :-)

hubbe (author)2013-12-23

why baking powder and not just flour or sawdust?

Ironwave (author)hubbe2013-12-23

It makes a chemical reaction, it turns rock hard instantly. It has a very high density when finished.
Try different things and see why bicarbonate of soda.
Make sure its the right stuff!
Different nations use different names for different things.

Ironwave (author)2013-12-23

Than you very much Audreyobscura.
I was pretty surprised myself when a search result didn't turn up any results as to this technique.
My only regret... I didn't pay attention when I googled for a high resolution picture;
thus I selected an inverted one and never noticed.

About This Instructable



More by Ironwave:Let's build a fixed angle knive sharpenerLets make a Anti Allergen vacuum cleaner (Genesis-like)An introduction to P-R-P. 'Poor man's Rapid Prototyping'. Let's build an IRobot keyring.
Add instructable to: