Questions tagged [3d-printing]

The process of creating three-dimensional objects out of plastic or other materials using a device similar to a printer.

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7
votes
1answer
194 views

How to prevent vibration loosening whilst maintaining adjustability?

I have some height-adjustment nuts screwed onto vertical threads to support my print-bed for a 3D printer. They are domed nuts and the aluminium build-plate sits on top of the domes, three holes in ...
6
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3answers
13k views

Is “pitch diameter” the same as the distance between the centers?

I am designing gears in FreeCad, and printing then on a FlashForge Finder. I want to know if the pitch diameter is the same as the distance between the centers of the two gears. Both gears are ...
6
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3answers
561 views

How do you make a 3D print with an accurately aligned bore hole?

I am printing a wheel with a 2.5mm hole in the middle to accept a shaft of a motor with a set screw. The problem I am having is that the wheel is always wobbly when spinning (sometimes more, sometimes ...
6
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2answers
4k views

What should the size difference be between a lid and a container?

I am designing a box and lid (for a home-made micro computer). Using Autodesk Inventor (Student Version), I've created my box which looks something like this: I plan on 3D printing (ABS Plastic) the ...
5
votes
7answers
2k views

Can I use AutoCAD to learn mechanical engineering by DOING (like programming)?

I would like to learn mechanical engineering as a side project. But, I would like to learn in a way similar to programming. Learn by doing. Of course I understand I can't build things automatically ...
5
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3answers
371 views

Snap fit on an enclosure

I am designing an enclosure, and top and bottom should be linked thanks to snap fit. I have to use 3D-printing to make both parts. The material is ABS. I made some trials, but they keep breaking. I am ...
5
votes
2answers
506 views

Evaluating performance of heat sink designs without finite element simulation

I have the opportunity to do a few metal 3D prints for just the material cost, and would like to experiment with the performance of heat sink designs (mostly for fun). Since I have no experience ...
5
votes
1answer
389 views

How do you create a chamfer in 3D CAD that joins the edges of two different shapes?

I am trying to make a 3D model. It consists of a cylinder resting on an extruded ellipse as you can see in the picture below. I now want to join the top edge of the ellipse with the top edge of the ...
4
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4answers
742 views

Why are many compliant mechanisms only flexible in the joints?

I've been playing around with 3D printing some compliant mechanisms, mostly to get precise linear motion, and I've noticed that many commercial compliant mechanisms are often designed like this: ...
4
votes
1answer
227 views

Are ABS/PLA too volatile to be used in cryo vacuum?

I need to use a custom part inside high vacuum (cryo vacuum), for example as a shadow mask. If PLA/ABS are not volatile, I could just print the part I need. The question is, are ABS or PLA too ...
4
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1answer
72 views

Where can I find technical drawings for computer parts?

I want to 3d print a custom computer case, I have the skillset to do so, however, I do not know where to find the technical drawings required. I need drawings for a 280mm Radiator, an ITX Motherboard, ...
4
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1answer
1k views

How to secure a rotating disc so that it has no wobble

For a 3D printing application, I need to have a spinning disc(that I will rotate via geared stepper motors) that will wobble as little as possible. By wobble, I mean that it will only rotate around it'...
3
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2answers
196 views

How to hold electrical wires on a part?

We are looking for a solution to hold two Power cables on a 3D printed part. This part is installed in a vibrating environment. So we need the cables to be pressed not to move and not to transfer ...
3
votes
3answers
222 views

Why is 3D printing with metals so uncommon?

What are the differences between the processes of 3D printing with plastics versus metals? Why is metal such a problem? There are plenty of metals with low melting points. And AFAIK metal can be ...
3
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1answer
208 views

Simple and easy Open Source CAD tools for basic 2D and 3D designs [closed]

We are planning to start a basic course on Computer Aided Designs (2D and 2D) for high school kids. The idea is to help them shape their innovative ideas into something tangible. We shall finally ...
3
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2answers
294 views

Implementing PID feedback control

I'm a Junior computer engineer working on a project involving a 3d printer. It is a mobile printer with the print head attached to wheels which move along the x,y axis of the surface it is printing on....
2
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3answers
71 views

Prototype for Injection Molding

Mold for Injection Molding is very expensive and is justified for mass production. However, at Prototype stage, how we make the same part with less expensive method. I know 3D Printing is a way but ...
2
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2answers
1k views

Sealing a rotating shaft in a 3D-printed part

I need to seal a rotating shaft that protrudes through a wall in a 3D-printed enclosure I am designing for a school project. The enclosure is for what will be a small generator that will be used in ...
2
votes
1answer
30 views

3D printed houses and energy efficiency in Germany

I have just learned that in Germany you wouldn't be able to print a house because of existing rules, especially regarding energy efficiency. Isn't it possible to print an insulating inlayer to fulfil ...
2
votes
3answers
141 views

Can photopolymers from 3D printer be fused together like for thermo plastics?

I'm considering getting a SLA 3D printer, but the big uncertainty is whether I can build large things like propellers by printing them piecewise and fusing them together like you can with ABS and ...
2
votes
3answers
392 views

Easily accessible material for maximum grip on a prosthetic hand?

Currently in the process of developing a 3d printed prosthetic hand and I am in need of advice on the type of rubber (or other material) we should use at the finger tips to give it more grip. The hand ...
2
votes
1answer
43 views

How to calculate the adhesion I need to keep a 3D printed bending part straight?

3D printed parts cool down during printing, resulting in thermal contraction which causes a bending moment and separation from the printing bed. The issue is solved by increasing adhesion to the ...
2
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0answers
132 views

Stretch part of object in Autocad or 123D Design

I'm quite new to using 3D Drawing programs, except a bit of work in Google's Sketchup. As I'm trying to draw a model that should be 3D printed, and heared that Sketchup is kinda bad practice for this, ...
2
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0answers
168 views

What material for DLP/SLA 3D printer bottom window?

What material is used for the bottom window of 3D printer that the cured resin layer does not stick to and that it is transparent to the uv (365 nm) light? And what material is used for the top plate ...
1
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3answers
61 views

Small scale manufacturing [closed]

Some background: I am working for an ed-tech startup and we are hoping to release our first product soon but have been hitting a lot of hurdles with our current manufacturing strategy. We want to ...
1
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2answers
50 views

Can wet welding be done in mineral oil?

I'm interested in knowing whether or not submerged welding can be done in fluids other than water, specifically mineral oil in this case. The reason I want to know is that I'm looking into designing ...
1
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1answer
44 views

Help understanding this dimension sheet

I am trying to currently model a few parts for my custom 3D Printer. I have found some flanged lead screw nuts i'm going to use, but i'm having a hard time reading the dimension sheet. Specifically, ...
1
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2answers
345 views

How to water seal a metal plate into the wall of a plastic water tank?

I have a 10 x 10cm square plate of metal I would like to insert into a hole in the wall of plastic water tank (cube shape), I'm planning on 3D printing the tank itself (only 1-2 litres). What would ...
1
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1answer
289 views

Difference between perpendicular and transverse loads?

What is the difference between perpendicular and transverse loads? I saw this on a forum for 3d printing, but I couldn't find any online explanations on what the difference between both measures of ...
1
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1answer
301 views

Are 3d printed gears (ABS) suitable for long term use?

i want to print a worm gear for a robot. This robot will work every day for at least 10 hours. The gears size is about the half of a sheet paper. I searched the internet for example in industrial use....
1
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0answers
53 views

Calculating Z-axis Torque on a 3-D Printer

I recently built a large CoreXY 3D printer and I am wondering if my 4 z-axis stepper motors combined will have enough torque to accelerate the build plate with a heavy 3d print. During the building to ...
1
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0answers
29 views

What are the limits of small 3D printed gears?

How much tangential force should I expect a 10~20mm pitch diameter/1.5mm gear module 3D printed rack and pinion system to support without breaking nor sliding?
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0answers
444 views

How to design CAD bevel gears from known outside diameter?

I'm working on a problem where I need to design and 3D print bevel gears to fit in the inside of a box and transmit a gear train around the inside corner, as roughly illustrated by the cross section ...
1
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1answer
404 views

How to build a pivot linkage for a robot.

I have asked this question in 3DPrinting.stackexchange forum but got no answer answer. Please take a minute to see if you can help. I am building a simple RWD vehicle using 3d printer parts. See the ...
1
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0answers
59 views

What is the maximum degrees per step of a stepper motor for a 3D printer?

I am making a reprap rostock (delta style printer) and I am trying to use as many parts I already have as possible. The stepper I have are 7.2 degrees per step. Even with microstepping, would this ...
0
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3answers
108 views

Why didn't 3D printing become a standard commodity after around 2012?

Around 2012, you had big news coming out about 3D printing: Things like replacement body parts being produced for about 1% the cost, individuals being able to produce guns off the printer, etc. You ...
0
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2answers
44 views

Polypropylene material characterization

I'm trying to make an evaluation of the available 3D printing options of polypropylene and I'm having difficulties comprehending material characteristics that make PP PP-like. I realize this sounds a ...
0
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1answer
105 views

Drilling PCB 3d printer bed

I need a heated surface for a project and was thinking of using one of these PCB heater beds. But I'd need to drill a few holes in it - can I do this without stopping it working? Thanks
0
votes
1answer
27 views

Feasibility of additively manufacturing large metal objects in microgravity/high vacuum (space)

This a somewhat speculative question; I would like to know whether it is feasible to additively manufacture large (>100m) metal objects - from for example aluminum alloys - in a space environment. ...
0
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1answer
232 views

Could stepper motor lose torque because of overheating?

I have a stepper motor on a 3D printer that heats up very bad because of the heated extruder (it is actually controlling the extruder). When this system starts, it works fine at the beginning, while ...
0
votes
1answer
53 views

What surface to use for 3D printer?

I'm mechanical engineering student who want to construct 3D printer. I have a problem choosing right and cheap material for bed. Bed will be big for a 3D printer, around 700mm x 500mm. I want to print ...
0
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1answer
53 views

Dimensions on a STL model

I have an STL file, all I want is to be able to measure dimension from point A to point B on the model in the file. How can I do this? I do have access to Solidworks but don't know if that the best ...
0
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1answer
50 views

Is it likely that a 3d printer will ever be able to print a copy of itself? [closed]

3d printers are still at a relatively basic stage and currently not capable of printing entire complex machines that require multiple materials. Is it possible that they will ever be capable of ...
0
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1answer
46 views

General purpose automated assembly?

I've been using 3d printers for prototyping for a long time, and I'll admit it's incredibly convenient to be able to throw together a CAD model, send it to the printer, and have it ready to assemble ...
0
votes
1answer
130 views

Why does the Ultimaker 3D Printer has a Heater + Heater transfer plate (aluminium) + Glass?

Why does the Ultimaker 3D Printer has a Heater + Heater transfer plate (aluminium) + Glass? I wonder why a glass plate, and if is possible to remove the glass and print directly in the aluminium ...
0
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1answer
35 views

Thickness of a 3d print general purpose plastic/PLA 230 V ~ isolator?

I'd like to design a minimal thin light switch which holds an illuminant with standardized socket, e.g. E14, E27, and has itself such a socket to be screwed in a support and a switch which will be ...
0
votes
1answer
91 views

How do I “subtract” sketches in CAD?

I am using 123D Design to build a model for 3D printing. What I want to build is a large 2D rectangle with several smaller rectangles inside. Then, I want to extrude the larger rectangle, but leave ...
0
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0answers
15 views

Is there any cost effective static stress simulation for rapid prototyping (FDM / 3D-printing)?

I've been using the static stress simulation (computed locally) which, until recently, has been free with the Personal licence of Fusion 360. Is there a reasonable alternative? The cost that Autodesk ...
0
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2answers
23 views

Sizing a spring

I am attempting to 3D print my own Quad lock mount and require a spring. I've taken some measurements but don't know how to search for where I can buy more springs. Dimensions: 12mm height, 20mm OD. ...
0
votes
1answer
8 views

Calculating Gearing Ratio from Constrained Rotational Linear Arc and Horizontally Opposed Rotation

I'm 3D printing an aircraft throttle unit as a POC and am trying to calculate the gearing ratios that are required in order transfer the full range of linear motion into a directionally opposed sensor ...