with the proper 3d printer and certain materials you can 3d print your mold then use the mold for mass production.

My local Makerspace was recently donated a small proto-type injection molding machine. It was barely used, as the company who donated it "went a different direction" for their parts (I think that means they outsourced the prototyping process). Either way, it gives us the perfect sized injection molding device for our makerspace. We do have the ability to carve from aluminum block with other tools, but digitally designing molds to be carved or printed out of high temperature plastics may be less time consuming and less costly for our members. I believe it has a force of up to 20T and can use up to 4 ounces of plastic per shot.

@acmegp

5 жыл бұрын

That level of injection molding machine will require steel or aluminum molds. You could try forming molds using high temperature moldable ceramics based in ceramic epoxy technology. You would probably need to keep the parts designed for lower injection mold pressures such as simple single part molds. Higher pressures will blow out a plastic mold and probably also a ceramic epoxy mold. There are 2 companies I am investigating that make these types of high temperature ceramic epoxies. www.aremco.com/potting-casting-materials/ and www.cotronics.com/vo/cotr/cm_castable.htm

Seriously useful video - thank you! Great explanations.

I was thinking about this recently and thought about making a negative version of whatever I print, and casting it in tin alloy...

Hi Davis is there a way to manufacture now and pay later? 2nd question os there a plastic molding machine that is modern enough to accept files remotely amd print?

Great, now where's my $1000 desktop injection molding machine

I just saw this video in recommendations, and your channel looks really cool! I would love to learn something about injection molding. It would be really nice if you can cover topics like how to design a mold (some basics of that, already found some resources on the internet about that), how to machine a mold (tools that you use, CNC machine, how to make it on the cheap), how to make small run injection molding with 3D printed parts and some kind of silicon mold, and maybe even how to make a simple injection molding machine, I saw some videos about that, but I have still some questions on that topic. I like learning everything, now I am 18 and in the future I would like to start a startup so I think this kind of knowledge can be useful to do things on my own and cut some costs. Also those topic are just so interesting that I would like to know about them just to know. Thank you for this video, I am subscribing and waiting for more!!!

@jonasribeirodasilvaribeiro5204

4 жыл бұрын

.. ..... .

@Runmarobot-Candace

2 жыл бұрын

amazing!

@dadafr3433

Жыл бұрын

ئر،e

Could the join between molds halves have a adjustable spring load so pressure can be adjustable for various parts need extreme high pressure during injection like platinum or diamond

How do the air escape from that little aluminum mold? Is there any little hole?

Great idea using a glue gun to show as a simplified example. Very helpful visualization. Thanks!

Please help where do you get that plastic hot glue gun rodes ???

very good,injection molding with real machines.Excelent process to the 3 d printing.

How did the hot glue get all the way in to each corner of the mould so effectively with no air bubbles? I thought that moulds needed to have little holes for the air to exit, which you then need to trim. Are those only required for metal casting?

@davistechinjectionmolding2327

6 жыл бұрын

In injection molding we rarely need overflows to provide additional venting as in other molding or casting processes. Rather the mold includes vent channels that are gaps between different surfaces of the mold. These are typically found on the parting line where the mold halves meet. These channels are not very deep, a few ten thousandths (.0002") of an inch deep to a few thousands of an inch (.002). The depth of the vent will vary depending on the material being molded. These vents allow the gas to escape, however there are sometimes not big enough for the short fill times usually used in injection molding. The result of this is often not a bubble, but rather burnt plastic in the last places to fill. As the gas pressure goes up, often to several thousand PSI of pressure, the temperature of the gas increases and actually burns the plastic in that area.

Thanks for the video! I appreciate you doing this! Which one is more cost effective? I am going to be making hardware mounts for a drum kit. Which option will be most cost effective? Do you have any references of products that have gone to market?

Do they both use the same kind of plastic?

Is the hot glue you use at the start of the video any particular type of plastic?

@chrisharries4919

3 жыл бұрын

Yes please.. could you tell us which kind of plastic did you use with the glue gun and where we can buy it? Thanks and congrats for your videos

What about making mold for PIM ?

Can you please tell me where to get plastic rods to use for melting in a glue gun for injection molding my part? I really need to start small run injection molding for a product I created and this would help jump start my business very much.

@davistechinjectionmolding2327

6 жыл бұрын

The rods used in this demo are just colored hot glue sticks. I purchased these ones from hotmelt.com. However, because of its low softening temperature hot melt glue, composed of PVA/EVA thermoplastic, isn't a terrible useful material for productions products. I use it here at the college for demonstrations, but even a hot car on a sunny day can cause the hot melt glue to soften and stick to a car dash or seat.

@nunyabiznis817

6 жыл бұрын

Darn. That's too bad. I thought is was plastic, not glue. I wish it was possible to make a plastics injection gun like a hot glue gun, that injected ABS, ASA or PETG plastic. I know I would buy one if the price was right.

@davistechinjectionmolding2327

6 жыл бұрын

The LNS injection molding units may be what you are looking for :www.techkits.com/ ? You can use lots of different materials. It isn't glue gun pricing, but it sure doesn't cost $100k. Like a glue gun It won't be terribly repeatable either.

This is really informative and presented in an absolutely brilliant way, thank you!

Hi, Interesting and instructive video. Can you tell me more about the plastic rod used in the gluegun. What kind of plastic is it, and is it possible to buy it? I don't have any 3D printer, so I would like to use same technic to make some small plastic parts using molds. Thanks.

@davistechinjectionmolding2327

6 жыл бұрын

It turns out that this plastic rod I'm using in this demo is just simply Hot Glue Stick. Many people don't know that hot glue is simply a PVA/EVA thermoplastic that has some additives that help it sick to particular substrate. I find that the general purpose glue sticks don't stick to aluminum and steel molds terribly well and so they are more useful for molding demos. Beware that high temperatures, like the inside of a car on a sunny day can cause these plastics to soften and melt. The particular glue stick used in this demo can be found here: www.hotmelt.com/products/infinity-red-hot-melt-glue-stick. It should be possible to do the same thing with a very low viscosity polypropylene or polythene polymer if you get it into a rod form. I've been meaning to make a mold for glue sticks for quite some time to try this out.

@allen5921

6 жыл бұрын

I think I could try this technique, or even with polypropylene or polyethylene sticks; I'll let you know the result here. Thank you for the tips and thank you for answering my question.Regards

@chrisharries4919

3 жыл бұрын

@@allen5921 hi, very good idea.. so did you already try with a propypropylene ?? Does it work.. and also I was wonder if there is some adhitive to make the glue stronger if the technique you say doesnt work..

@chrisharries4919

3 жыл бұрын

@@davistechinjectionmolding2327 very good videos congrats..I was wonder me if there is some adhitive to make the glue stronger if the technique using polypropylene stick doesnt work..

whats the difference in strenght ?

Wouldn't a fair comparsion include the time making the mold? :P

@davistechinjectionmolding2327

6 жыл бұрын

I did cover this a bit in the second video. Certainly a huge hurdle for injection molded parts is the mold. Molds are expensive and can take a long time to build. As a general rule, injection molding is good for higher volume products, and 3D printing can be used for some lower volume parts. When production volume for a part is high, the cost of the mold and the time to build it become less significant. However there are still many parts that a manufacture may only need just a few hundred parts, but still create a mold and injection mold the product, in these cases they just currently can't get a part from 3D printing or other processes that meets the customers quality requirements. So what to I mean by high volume? Well starting off at 500 units for some parts, but certainly in the range of 10,000-10,000,000+ unit a year.

@Mr.FastZombie

5 жыл бұрын

The mold is like a start up cost. You only have to do it once, so it can pay for it self pretty quickly if you need to make a lot of the same part.

@tomgirl366

4 жыл бұрын

@@davistechinjectionmolding2327 how do Chinese molding toys cost so less ?

@jasonreed2976

3 жыл бұрын

Davis Tech Injection Molding who do you contact about getting a part made?

@Kameron-The-Crafter

3 жыл бұрын

@@tomgirl366 usually labor. Plus the Chinese are kinda known for skimping on quality if company asks them too.

Injection molding is where it's at. I never liked the finish on a 3D print. I know it is way more expensive though.

So what’s better or really no difference in quality of the finished product?

Call Melco engraving for any texturing repair and more, tell them Matt sent you for a discount. Thanks

Could you say something about how the mechanical properties of 3d printed and injection molding pieces compare ? Using a same material which one is stronger? Thanks!

@welshsteve2009

3 жыл бұрын

Injection moulded parts will always be stronger than the same parts 3D printed. In the injection moulding process, the material is injected as a homogenous melt under pressure into a precisely dimensioned moulding tool. As the material cools, it shrinks but is ‘topped off’ so to speak with continued pressure called ‘hold pressure’ or ‘follow-up pressure’. Precise control over speed, temperature and pressure will yield parts with high dimensional tolerances. A range of surface finishes can be achieved, designed into the surface of the mould tool and could be anything from a texture, a pattern or a design to a mirror finish. In the 3D printing process, the material is deposited layer by layer, out in the open. Each layer bonds to an already cooled layer, with layer adhesion being one of it’s many drawbacks. Each layer shrinks as it cools so dimensional tolerance will be another obstacle to consider. Additionally, layer lines will always be visible even with the finest nozzle and Z height unless the part undergoes some post print finishing. One could argue that the addition of fibreglass reinforcement in the 3D print filament will yield stronger parts but this will only strengthen individual layers as the strands can’t link between layers. Conversely, with the addition of fibreglass in injection moulded parts, the strands are distributed fairly evenly throughout the entire part yielding an even stronger part.

@gambarimas

3 жыл бұрын

@@welshsteve2009 thank you very much for your detailed answer ! Could you also tell me something about the spatial resolution attainable with both techniques nowadays?

@welshsteve2009

3 жыл бұрын

@@gambarimas Regarding your question about spatial resolution: I’ve got no idea 🤣 I can’t imagine that spatial resolution would apply to injection moulding. However, with 3D printing the part is built up in layers with each layer thickness determined by the Z height. For a higher quality finish a low Z height might be specified which is the equivalent of printing an image with smaller pixels (higher resolution). However, more layers doesn’t necessarily mean a stronger part as there are now more layers subject to the same layer adhesion issues. I’m not an expert in FDM printing so it might be better to do some more research into this area. I’ve seen numerous KZread videos dedicated to the very topic of layer resolution and layer adhesion. FYI, I worked in the moulding industry for over 20 years as a moulding setter, moulding technician, and process and maintenance engineer on machines with clamp forces ranging from 10 tons to 850 tons and in a wide range of polymers. I’ve also had some experience with blow moulding.

@gambarimas

3 жыл бұрын

@@welshsteve2009 I see. Thank you very much for taking the time to answer my questions!

Clearly a $500 desktop 3D printer can't keep up with a professional machine bigger than my bathroom. What I'm SUPER curious about is: Is there a way to make a small-run injection mold from a 3D printed part? How do these technologies compliment each other, instead of compete with each other?

@davistechinjectionmolding2327

6 жыл бұрын

I did a project with the Stratasys a few years ago to demo injection molding into a 3D printed mold. You can see a very brief video about these on my channel here: kzread.info/dash/bejne/fJWYw7mRobeehJs.html. Let me know here if you would like me to do a longer video showing the process. I was asked by a local Stratasys dealer to host a presentation on using 3D printed molds to accelerate product development. I started the project with a lot of doubt of the technology. I was asked to design a product, design a mold for it, and injection mold part using that mold in a few days. It turns out that it worked fairly well. In a few, I think three business days I had created the design for this clam shell light Christmas light cover with snap fits, design the mold inserts, they had printed them, and I installed them into a mold base and made injection molded parts. Of course the cycle time was ridiculously long, ~ 160 seconds, in comparison to a metal mold, like 15 seconds, due to the low thermal conductivity of the plastic mold, but that isn't the point. The point is that if you are designing a product and need to have real injection molded parts that have the real material properties and strength you expect when they will be mass produced in an injection mold, well then you really need to injection mold parts from a real mold in a real molding machine. If you produce these using a traditional metal prototype mold then you will be delayed a week or two between iterations of designs. With the 3D printed mold you might only be delayed overnight or a few days to design a new mold and print it. It doesn't necessarily make the injection molding of low volume products less expensive, but does reduce the time to market in the product development processes. And no, so far I'm not aware of much success of people using FDM printers to make injection molds, but you can certainly resin cast low volume products using FDM printed molds. There is lots of information on KZread about that.

@Benoit-Pierre

6 жыл бұрын

They complete each other. Injection molding machine is faster for simple shapes , when you need a large volume. Printing allows very complex shapes using curves impossible by injecting, two materials at the same time, at small volume of production. An Injection mold costs a few thousand euros. So the first piece costs you 10ke or 100ke. You need a huge quantity to have this cost profitable. And of course you need to rebuy a new mold for every single small modifications of the product. With printing, the first unit costs you only your printer and 10e of injected material. And you can change your model any time without any cost. It's the best for prototyping.

@akramazgal4788

5 жыл бұрын

hey Davis i had this idea of using 3d printing for active parts of the mold as with this method you can correct your mold design in case of defaults in the injected part but i was wondering if 3d printed active part mold made of ABS for exemple will keep it shap with the high temperature of the injected plastic which is usually have a similair melting point as the 3d printed part !

@elmareao

4 жыл бұрын

@@davistechinjectionmolding2327 At your video you inject plastic from a pistol to a mold. As a real machine does I guess. But I never seen a manual injection like that. Can you explain how did you do that? Is it plastic or what kind of material (looks strong). I have seen small and almost mechanical injections artifacts but never something so manually that can give you a piece SO fast (as it was really injected). That fish could take like 2 hours in a 3d printer.

What is model of gun of the minute 0:30?

Worked for Milacron for 40 years.

Your hot melt glue gun.. would it be possible to extrude HDPE sticks, and diy injection mold like your example?

@davistechinjectionmolding2327

6 жыл бұрын

It should be possible, if the viscosity of the polymer is low enough. I have tried this with some extruded HDPE rods and it has not worked out well. This ins't too surprising given that most HDPE grades used for extrusion have fairly high viscosity. I've been meaning to get around to molding some sticks with a very low viscosity polypropylene, but just haven't had a chance to build the mold yet. Maybe someone else will beat me to it?

@preciousplasticph

6 жыл бұрын

Davis Tech Injection Molding I am building a extrusion machine from the Precious Plastic project blueprints. Have you seen that?

so helpful thanks

Thanks for sharing this video

This was good

You explained this so well for the lay person, thank you so much! Bonus points for the demo! 🙌🏾

Very good

where can I buy this gun for injection 0:32

@noctvlog

4 жыл бұрын

@Thu Nell Ⓥ thanks . this one is for glue but me need one for plastique

Good job

Thanks for make good video and benefit information

Where can I get a hot glue gun like that ?

Great

gun name?

@davistechinjectionmolding2327

6 жыл бұрын

The glue gun used in this video is the TEC 805-12. However any hot melt glue gun will work, but this one melts the polymer quickly.

@spamspasm8183

4 жыл бұрын

@@davistechinjectionmolding2327 What kind of polymer stick did you use in the glue gun? Thanks in advance!

Good, basic video.

The question is, how much does that industrial printer cost? At least $200k, where as the best 3D printers on the market are like 10k at the most, not a fair fight

@acmegp

5 жыл бұрын

Sounds like you do not know much about the cost of these machines. 3D printers designed for home or hobby use are less then 2K and decent used injection mold machines can be had for 5k, or even less. There is a huge difference in running these. if you buy a 3D printer and have never run one before, you could be in for a steep learning curve. Same thing for an injection mold machine.

@cromeaxe

2 жыл бұрын

One is for prototyping and another for mass production

just print the positive and negative for your mold

@Leotique

4 жыл бұрын

hahaha lol nice idea actually

For prototypes 3d printing is fine but not for production

Good! We are injection machines manufacture factory

I had to laugh when you used a glue gun to fill your little mold. And people are buying or fabricating dangerous garage contraptions. great job!

Salut

try making a different model faster then 3d printer.... (you need a freaking mold, and for 3D printer u just needa MODEL)

Can I get your email or whatsapp ? I want to show you a sample, and want your suggestion on which will be the best option to print. Thanks

@jonasribeirodasilvaribeiro5204

4 жыл бұрын

..

Generalising a 3D print. Don’t forget there are more technologies out there a thousand times better than that heap of junk.

3d print your injection molds. Gg.

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