28 votes
Accepted

Designing clips that won't break

It looks like those clips are thin and need to bend pretty far to let the vial out. Try to make the clips thicker, but with a smaller clip to retain the vial so that it doesn't have to bend as much. ...
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15 votes
Accepted

Does the layer thickness have any effect of the strength of the 3D printed object?

3D Matter has published an excellent article on the subject. They find that thicker layers result in a stronger part, with 0.3mm layers giving a part that is around 24% stronger than the same part ...
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14 votes
Accepted

Improving durability of a printed propeller

As Kezat noted, your part has very low infill, but infill is not what provides most of the part strength anyway. From what I can see of the broken part, it looks like you only have 1 or at most 2 ...
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11 votes

Designing clips that won't break

I agree with the previous assessments -- printing vertically for that part of the clip will definitely alleviate the layer adhesion being your weak point. You might also consider splitting that clip ...
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  • 121
8 votes

Designing clips that won't break

Considering that you wish to print the clip in the vertical orientation but without supports, I would suggest that you create a suitable taper of the clip from the bottom. The taper would provide ...
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7 votes

Designing clips that won't break

Come on. Wider clips will just survive a bit longer. The real cause is the orientation (plane) of printing. Continues filament layer will always be more durable than few layers sticked together. So ...
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  • 3,438
7 votes

Improving durability of a printed propeller

I'm offering a different kind of answer, please do not print your propeller blades. I've seen accidents happen (in my past international model aircraft building and flying hobby) with even the bought ...
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  • 31k
6 votes

Improving durability of a printed propeller

You need WAY more infill or make it solid. Normal props like this are 100% solid for a reason. To add to that, in my experience with 3D printing the the infill percent is only part of the story for ...
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  • 343
5 votes
Accepted

How do you assure that you print layers that bond correctly?

I think the reason why the large cylinder is breaking much easier than the smokestack would is because of leverage. If you print the same cylinder at a much smaller scale it might be more difficult to ...
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5 votes

DIY tensile strength testing

For these kind of tests you could rely on the ASTM standards. They define test procedures and test specimen sizes for different types of tests. Or you can derive a specimen yourself based on these ...
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  • 31k
5 votes

Improving durability of a printed propeller

A nitro engine rotates much faster than an electric one, 30k rpm vs 10k rpm top. Also, it has much more vibrations (the engine gives torque in sharp pulses, not a continuous power generation). There's ...
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  • 3,806
4 votes
Accepted

What should I think about if I want to design something modular?

All printers are designed with an idea of WYSIWYG for sure. Depending on: printer - type/quality/settings/configuration/assembly precission filament - type/quality/shrinkage user skills - manual/...
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  • 3,438
4 votes

How to determine shell thickness for parts?

As alluded to in 0scar's answer, it is important to stick to multiples of your nozzle width for thin shells. If you try to print a 1mm wall with a 0.4mm nozzle, you give the slicer a bit of a ...
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4 votes

How to determine shell thickness for parts?

This totally depends on what you think is acceptable for your print, and what the usage of the print is: is it a structural/functional part or just for aesthetic purposes. There is no general rule of ...
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  • 31k
4 votes

Why does my PLA filament keep snapping?

PLA seems to become brittle with age. Micro-fractures develop on the surface, and they will grow if filament is taken off the spool and held straight. This behaviour does not seem to be linked to ...
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  • 2,972
4 votes
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FDM layer bonding strength

I have not been able to find a simple model for FDM part strength. FDM parts are pretty complicated as they have a LOT more things that affect their strength than just layer adhesion. Since any "...
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  • 2,412
4 votes

Is it safe to print a rotor insert for a centrifuge using a makerbot?

It's difficult to determine if the buckets are fully enclosed, but I suspect that they are. The enclosure into which the inserts are placed will provide some structural support. 3D printed objects ...
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4 votes

Designing clips that won't break

The Short Just print vertically Reduce the clip size to bring them closer to the centerline Try a vapor treatment or epoxy to increase strength The Long Ultimately, printing the object vertically (...
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  • 6,214
4 votes
Accepted

3D Printed Lead Screw

Expanding on some previous comments which are probably enough to warrant an answer: What Trish said is completely right. Leadscrews are readily available parts and any dimensional errors in the ...
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3 votes

Designing clips that won't break

Printing the model vertically should certainly be considered, as that will alleviate your issue by a whole lot. If altering the design by adding a taper to your model isn't what you are looking for, ...
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3 votes

What is a good way to estimate the impact on material strength different printing methods will have?

This is a good question, which hadn't received enough researchers' attention. People regularly print different objects, some of them with strength requirements and the need for a method of strength ...
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3 votes

What is a good way to estimate the impact on material strength different printing methods will have?

It's hard to tell without actually testing the part. There are many ways you can 3D print a part, even on the same machine, that can yield different results. Here are some tips to help uphold ...
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  • 6,214
3 votes

What slicer settings would produce the strongest part?

If your real question is what would be the strongest then I say - the solid would be the strongest - no doubt. But if the question is: what be the strongest in comparison to weight or what is the ...
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  • 3,438
3 votes
Accepted

Typical plastic strength at 1500 RPM

Really the only thing that would matter for this project is the amount of torque the motor has available and subsequently how heavy your setup is that is connected to the motor. A part that size may ...
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  • 6,214
3 votes

What should I think about if I want to design something modular?

A book you would benefit from reading is "Functional Design for 3D Printing...Designing 3D Printed things for everyday use - 2nd Edition" by Clifford Smyth. It deals with FDM printing only. It ...
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3 votes

How do you assure that you print layers that bond correctly?

No matter what you do, the adhesion between layers will never be as strong as the adhesion in the direction of layer application. It's analogous to a wooden baseball bat (for those old enough to ...
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3 votes

Is it safe to print a rotor insert for a centrifuge using a makerbot?

It is my understanding that you are looking to print the insert not the gimble bucket. The gimble bucket portion would be difficult and have high risk. Fdm 3d printing looks like it would be a good ...
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3 votes

Why does my PLA filament keep snapping?

When water gets absorbed into the filament, it causes some of the long chain polymers to break. This is a permanent reaction that cannot be fixed by baking the filament, which typically results in the ...
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  • 2,286
3 votes

3D Printed Lead Screw

Is it possible? Yes. Is it advisable? No Lead screws need to be smooth and have little to no stretch and there can be a lot of tension on them. However, 3D prints are quite rough by the way they are ...
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  • 19.5k
2 votes

How to calculate the strength of a printed object?

Strictly speaking, it is difficult to do calculations on these materials, but not impossible (I've heard about a few commercial analysis tools that do that). The FDM process (Fused Deposition Modeling)...
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