What is Printing: Definition and 120 Discussions

Printing is a process for mass reproducing text and images using a master form or template. The earliest non-paper products involving printing include cylinder seals and objects such as the Cyrus Cylinder and the Cylinders of Nabonidus. The earliest known form of printing as applied to paper was woodblock printing, which appeared in China before 220 AD for cloth printing. However, it would not be applied to paper until the seventh century. Later developments in printing technology include the movable type invented by Bi Sheng around 1040 AD and the printing press invented by Johannes Gutenberg in the 15th century. The technology of printing played a key role in the development of the Renaissance and the Scientific Revolution and laid the material basis for the modern knowledge-based economy and the spread of learning to the masses.

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  1. bmminc

    Looking to get into 3D printing and engineering

    Hey guys :)Can anyone point me in the right direction on where to start with 3D printing engineering? I'm kinda lost but I'm super pumped and very very motivated to learn this stuff!
  2. Vigardo

    How to export an ANSYS model into STL format for 3D printing

    Hi experts! Do you know how to export an ANSYS model into STL format? I´ve only found some method for solid meshes here http://www.padtinc.com/blog/the-focus/color-3d-printing-ansys-ansys-mechanical-and-mechanical-apdl-results, but my model contains only BEAM4 elements. Would it be possible...
  3. PicassoCT

    Exploring the Potential of 3D Printing Plasma Structures in Midair

    Hi everyone, i recently saw some videos were a microwave laser (gaser) was used to create a plasma in midair. So the first part of my question is, if you could handle the ray fast enough, could one print 3dimensional-layered plasmastructures into non-disturbed atmosphere? If no, what did i not...
  4. I

    MHB How do I print error statements when using if and else commands in C++?

    im using the if and else commands in c++ and for the else i want the program to print an error statement. how do i do this?
  5. K

    Looking for 3D printing and Milling services

    Hello! I currently have a machine fully designed to fold newspaper and place rubber bands on them, yet I do not have a way to create the parts themselves! I ask of anyone if they know of a service where I can send a CAD drawing (specifically Autodesk Inventor) and have them mill or print the...
  6. R

    3d printing with Polylactic acid, adhesion to print bed

    I recently built a 3d printer that extrudes PLA or Polylactic acid for the material. When printing on a glass bed the pla drags behind the extruder because it won't stick to the glass. On the other hand printing on a sheet of acrylic the PLA sticks so well that it is difficult to remove after...
  7. R

    3d printing with Polylactic acid, adhesion to print bed

    Polylactic acid (PLA) is a very popular raw material used for plastic extrusion 3d printers. Myself and many others in the 3d printing community have have experienced difficulty getting the the first layer to stick to the bed. I have tried a couple things so far 1) Heated smooth glass bed...
  8. B

    3D Printing Technology/Additive Manufacturing

    Hello Everyone, I am currently in my last year of studies, working towards a BSc in Mechanical Engineering. Anyway, I recently came across a very interesting article about the recent advancements in industrial 3D printing. The article discusses 'AMAZE', a project launched by the European...
  9. L

    Printing a QR code on a POS receipt

    Hi guys, Does anybody here have an understanding of POS (point-of-sale) technology. I am looking for a way to print a QR-Code onto a till receipt if the dollar spend is over a set amount. The QR-Code information to be printed would be pulled from a 3rd party server. Every till receipt that...
  10. T

    Precision particle delivery via laser for 3D printing

    Greetings PFers, I was thinking about methods of delivering mediums used in 3D printing process, specifically 'selective laser sintering'. Currently SLS uses layers of fine metal powder which are fused together, layer by layer. A new coating of powder is applied every layer. Afterwards, the...
  11. V

    Is it possible to use 3D printing to help end world hunger?

    Hey guys, I have been reading some articles recently and I have came acrossed an article that the SMRC (Systems and Materials Research Corporation)(with its support from NASA) has a grant that supports its project in creating 3D editable food (pizza) using 3D printing (apprently one of the...
  12. ChristinaJ

    Mathematica Mathematica: Duplex Printing from button inside DialogNotebook on Mac

    All, I have the following code which generates a window containing the variable PrintOut and a Print button. When the print button is pressed the contents of the window are sent to the printer and simultaneously a pdf is generated. PrintOut = "Some stuff - plots, tables etc."...
  13. jegues

    Program for printing a list of PDF files

    I am trying to figure out if it would be possible to develop simple program to preform the following task: If I have a list of drawing numbers contained within excel an file as such, 1-02632-M-07502 0002/03 1-02632-M-07502 0003/02 1-02632-M-07502 0004/08 1-02632-M-07502 0005/02...
  14. E

    Calculating the pressure force of a lever roller printing press

    Hello Everyone. I need some advice in calculating the pressure of a roller printing machine. The machine is operated by a geared rotating lever which moves the impression roller across a print surface. I had thought it was a case of using the equation for rolling friction to work out the normal...
  15. S

    Photoelectrodeposition for 3D Printing

    3D printers are receiving a lot of attention in the news these days, because they are seen to be a potential disruptive technology. However, most devices of this type are very limited in the materials they can work with, mainly fabricating models in plastics like PLA or ABS. Advanced high-end...
  16. V

    Programming in C question. Printing Arrays

    Homework Statement Alright, I actually solved this problem myself, it is just ugly and hilariously inelegant. I won't lose points since it is an introductory course, and it technically works, but I wondered what the "right way" to do this is. Here is what I had to do. Create an array where...
  17. 7

    Mathematica Printing only integer values for some equation using MATHEMATICA.

    Hello every one, I need help on some mathematica run program. Suppose the following: 1) 2=<t=<1000 2) r=3+2Sqrt[2] 3) k=(r^t+r^(-t)-20)/4 4) n=2k+4 5) x=n/2-(r^t-r^(-t))/2Sqrt[2] I need to run the program For[t=2,t=<1000,t++ and only print if it found any...
  18. C

    Reverse String: Fixing Compiling Warning

    Homework Statement I am trying to write up code to reverse the order of a string i.e. input: and output: dna For some reason I am getting this compiling warning but I don't know what's wrong with my code... Homework Equations The Attempt at a Solution #include...
  19. Angelos K

    MATLAB Why are there saw-teeth on my Matlab eps prints?

    Dear all, I generate some MATLAB figures that I want to print as eps. The figures look fine in the .fig format. When I open the eps, there is a problem. Wherever there is a vertical line (or part of function) the line shows tiny saw-teeth. I would like to attach I file but it seems one can't...
  20. J

    Mathematica Mathematica: Printing Numeric Result

    Hey, So I am fairly new to Mathematica (and the physics forums too). I am having a problem with mathematica not calculating the numeric result to an very complex integral. My question is, how do I force it to evaluate the integral as a number? I'm assuming that the integral of a square root...
  21. N

    Mathematica Printing results if certain conditions are met in Mathematica

    Hello everyone, I have for loop in Mathematica. After every step Mathematica has new results calculated. I want to see only some results, those who met certain conditions, not results from all steps. Say, I have 10000 steps and I don't need all 10000 results, but only those that met certain...
  22. P

    Fortran Fortran: printing the Printing the Hex contents of a character variable

    Given a character variable character*10 name write (6,111) name 111 format (?) what do I put in the format statement to print the hexadecimal contents of name?
  23. J

    Comp Sci C++ Why is my function printing TWICE?

    Homework Statement My printArray function, when called in my int main() with the arguments ("***monthly total***, sums, NUM_MON) is printing out twice as many times as it should be, and for some reason, even the string caption is printing out as "******monthly total******" instead of...
  24. D

    3D printing a gear box, I'm having some problems with the gears getting stuck.

    I'm building a simple 20:1 gearbox prototype with 2 compound gears in a row connecting to a third small gear at the end. My goal is to multiply the rotational speed of the small gear. They are all engaged on a straight line. But for some reason they get stuck most of the time. I'm trying to...
  25. G

    MATLAB MATLAB function printing extra matrix?

    I'm a newbie to all things programming, and have to write a program implementing the Euler method to approximate an ODE. Anyways, the program works but when I use the function I wrote I get an extra matrix of zeroes above the desired output, which I don't understand as I have suppressed the...
  26. F

    Comp Sci C++ Binary Search Tree preorder printing tree problem

    Q.When run the program should ask for an input file containing integer keys to be added to the search tree. The file will contain one key per line. Add these keys in the order given in the file to the search tree. Then print the entire tree using preorder traversal i.e., root, left-child...
  27. J

    Water transfer printing activator ideas

    hi, I am from scotland uk and have little chemistry knowledge so i hope I've posted in the right section to start lol. as in the uk I am finding it difficult to get activator for water transfer printing. there a few formulas that can be mixed up by myself but id rather be able to understand...
  28. M

    Printing a multipication table from user input

    My assignment was to "create a Python script that will allow the user to input the starting value for the row and column of a multiplication table and then print to screen the table containing ten columns and ten rows. Include a header for each row and column" I was able to produce the...
  29. T

    Comp Sci Why Is the Char Not Printing in My C++ Program?

    Homework Statement After I typed in the name, and tested it by running " lookup " under "option". But the "name:" showed nothing. #include <iostream> #include <cstring> #include <cstdlib> using namespace std; const int name_length = 20; struct student { int idnum; char...
  30. D

    Notebook with plain white printing paper?

    For some reason I feel very restricted with using lined paper in notebooks. I think I could organize my thoughts better and take better notes with just plain white paper. If they're loose, I'd lose them and/or crumple them unintentionally. Are there any notebooks out there that are reasonably...
  31. 7

    How to put a condition for printing in mathematics

    Hi All , what I am trying to do is, after getting so many solution I just want to print only the intger solution: For[n = 0, n ≤ 10, n++ Do[Print[{n, (n - Sqrt[Sqrt[ 2]Sqrt[3n^2 - 9n + 8] + 3n - 4])/2, OTHER SOLUTION, (n - Sqrt[-Sqrt[2]...
  32. J

    MATLAB How to code an fprintf if I am printing a value

    ok I know how to code an fprintf if I am printing a value, but I want to make a "title" print for example. Mass Time Error fprintf values here. ... ... .... fprintf values here... ...
  33. G

    LaTeX Printing Latex Code from University Computers

    Not sure where to post this. I'm trying to write my dissertation, and both the examiners and I would prefer it if I used latex for the required notation. The frustrating thing is that even though I do know how to produce latex code, I don't know how to save it into a format that the computer...
  34. Z

    Terrible textbook printing quality

    I have been plagued with bad quality printing in textbooks, so many different publishers with a quality of printing that can only be described as ****, and it is doing my head in. If you're familiar with Landau & Lifgarbagez series of books, to my knowledge they are only published by...
  35. D

    Comp Sci Fortran 77 reading from text file, printing

    Homework Statement Write a program that reads the time, temperature, pressure, and volume measurements from a data file like : 0900015001990700 1000019602210877 1100021202790925 1234034203221015 1300038803221121 1400044803241425 1503051303201520 1604055503181665 1700061303191865...
  36. J

    3D Printing and CAD for Robotics

    Hello! First post here at the forum. I am a member of the underwater robotics team at my school, and I have been put in charge of building the arm. I won't get too specific about the design of it, but it will include gears, motors, and stuff in between. Luckily enough, my school owns a 3D...
  37. S

    Probability of a page being free from printing errors

    A book of 100 pages contains 200printing errors distributed randomly among the pages. the probability that one of the pages will be completely error free is closest to a)67% b)50% c)25% d)13% The Attempt at a Solution I tried to calculate total number of possible events. I...
  38. N

    Print Documents: Disable Keyboard for Printing

    Is there a way to print documents that disables your keyboard?
  39. M

    Comp Sci Trouble printing to a file C++

    it prints fine for the first generation, but nothing else after that. i am thinking that my problem lies in the cellStatus function and its implementation within the printCell function. attached are the files that i am getting input from and the file that i am printing to. #include...
  40. D

    Fortran Question about printing with FORTRAN

    Hey guys, I tried looking around on the web and came back without much luck.. Is it possible to print FORTRAN output using FORTRAN code? When I say "print," I mean to a local printer such as a laserjet.. not just printing to the terminal screen.. I've searched pretty intensely on the...
  41. J

    3D printing of Riemann Surfaces

    Hello. Does anyone know of a group that has used 3D printing techniques such as laser sintering to create Riemann surfaces of some simple functions? For example, just \sqrt{z}? Actually I would be interested in more complex function and preferable color-code various components of the surface...
  42. Rasalhague

    Printing mistake in A First Course in General Relativity?

    Is is a typo? The 1985 edition of Schutz: A First Course in General Relativity, p. 52, equation 2.37, which is supposed to express the idea that "photons have spatial momentum equal to their energy": \vec{p} \cdot \vec{p} = -E^2 + E^2 = 0. Shouldn't this be \vec{p} \cdot \vec{p} = E^2...
  43. B

    Printing a Binary Tree: Solving the Space Issue

    Hi, would you mind helping me in solving this problem? Because I stuck now. The problem is to print a space in a binary tree (not binary search tree) my current program can only output without appropriate spacing so if input is : 4 7 8 9 2 0 3 1 5 the output will become 4 7 8 9 2 0 3 1...
  44. B

    Fortran Printing 1D array in Fortran as 2D array

    Delete.. Delete..
  45. L

    Mathcad 14.0 - Displaying / Printing

    I am new to Mathcad and using it is redefining my idea of hell. All i want to do is type some equations and then print it out. Nothing more sinister. When i type the equations in some times they go red and i get a message appear like "a name is required here" i couldn't care less about...
  46. S

    Comp Sci How can I print integers as a string in C++ using character arrays?

    Homework Statement I have a bunch of integers stored in a character array, and I am trying to print the integers as characters. I can print them as characters when I use %c in the print statement, but the problem is I need to print them as a string. My program crashes when I attempt to use...
  47. Z

    Proving the Equation: <N> = 1 / exp (E-U)/KT +1 from Zg = 1 + Exp (-E-U)/KT

    Hi guys, I have a question which equation i need to prove: <N> = 1 / exp (E-U)/KT +1 from Zg = 1 + Exp (-E-U)/KT where <N> = kt 9 d (ln Zg) / dU I have <N> = 1 / exp (U-E)/KT +1 is the Zg they have given me incorrect? I find my answer very simliar, is it a printing error? My...
  48. K

    Fortran Why is Gfortran not printing on Cygwin?

    I use gfortran on cygwin and i want to print in the command window (like it prints in windows) i use the usual stuff: WRITE(6,*) 'Give a number:' or PRINT(6,*) 'Give a number:' but the execution completes without any printing.. What is wrong?
  49. M

    Designing Airfoils: Choard Sizing & Printing - Low Reynolds #50000

    Hi I need a software for designing airfoil that alows changing the choard size and printing. If you know any please tell me. Btw do you know any refrence for low Reynolds number (about 50000)? I want to choose NACA7610 for my glider but I don't know exactly how it behaves at low Reynolds...
  50. L

    Printing A Circuit Board Design

    Hey guys, I'm trying to make a circuit board for my school project and need to print the pattern. The thing that makes this slightly trickier is that some of the traces are 0.4mm apart. Now either way I need to print over twice, and that's not an issue, I can double layer it easily. I'm just...
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