Printable Corrective Action: Fill & Download for Free

You can make a 3D printed gun.I am no expert on gunsBut here is the thing,You get one shot if that.Plastic is not strong enough to with stand the pressure of a bullet firingFurther more, can you trust the design?A gun is more than a bullet in a barrel and a trigger.A gun is a machine and like most machines, they have tolerances for safe and correct operation.Even if you were to make an identical copy of say a colt single action army.After you fire it, the tolerances have changed due to plastic deforming from the pressure of the bullet being fired.

Edit 5/23/2020: Given Jesse Pollard’s answer, I’ve corrected mine. I originally thought this came with Xerox Interlisp in 1978, but it was created much earlier, in the ancestor to Interlisp, called BBN Lisp.DWIM - WikipediaMy candidate is Warren Teitelman, who created a feature in BBN Lisp, called “Do-What-I-Mean,” or DWIM, before 1966. It was a form of autocorrect for Lisp.From Section 17 of the Interlisp Reference Manual, titled “AUTOMATIC ERROR CORRECTION - THE DWIM FACILITY”:DWIM is called automatically whenever an error occurs in the evaluation of an Interlisp expression. DWIM then proceeds to try to correct the mistake using the current context of computation plus information about what the user had previously been doing, (and what mistakes he had been making) as guides to the remedy of the error. If DWIM is able to make the correction, the computation continues as though no error had occurred. Otherwise, the procedure is the same as though DWIM had not intervened: a break occurs, or an unwind to the last errorset, as described in Section 16. The following protocol illustrates the operation of DWIM.EXAMPLEThe user defines a function fact of one argument, n. The value of fact[n] is to be n factorial.> DEFINEQ((FACT (LAMBDA (N) (COND ((ZEROP N9 1) ((T (ITIMS N (FACCT 8SUB1 N] (FACT) > Note that the definition of fact contains several mistakes: itimes and fact have been misspelled; the 9 in N9 was intended to be a right parenthesis, but the shift key was not depressed; similarly, the 8 in 8SUB1 was intended to be a left parenthesis; and finally, there is an extra left parenthesis in front of the T that begins the final clause in the conditional.> PRETTYPRNT((FACCT] =PRETTYPRINT =FACT  (FACT  [LAMBDA (N)  (COND  ((ZEROP N9 1)  ((T (ITIMS N (FACCT 8SUB1 N]) (FACT) > After defining fact, the user wishes to look at its definition using PRETTYPRINT, which he unfortunately misspells. Since there is no function PRETTYPRNT in the system, a U. D. F. error occurs, and DWIM is called. DWIM invokes its spelling corrector, which searches a list of functions frequently used (by this user) for the best possible match. Finding one that is extremely close, DWIM proceeds on the assumption that PRETTYPRNT meant PRETTYPRINT, notifies the user of this, and calls prettyprint.At this point, PRETTYPRINT would normally print (FACCT NOT PRINTABLE) and exit, since facct has no definition. Note that this is not an Interlisp error condition, so that DWIM would not be called as described above. However, it is obviously not what the user meant.This sort of mistake is corrected by having prettyprint itself explicitly invoke the spelling corrector portion of DWIM whenever given a function with no expr definition. Thus with the aid of DWIM, prettyprint is able to determine that the user wants to see the definition of the function fact, and proceeds accordingly.[Note: This example has the user running fact with the value 3, first, and then “pretty-printing” fact’s definition. — Mark Miller]> FACT(3] N9 [IN FACT]-> N ) ? YES [IN FACT] (COND -- ((T --))) ->  (COND -- (T --)) ITIMS [IN FACT] -> ITIMES FACCT [IN FACT] -> FACT 8SUB1 [IN FACT] -> ( SUB1 ? YES 6 > PP FACT  (FACT  [LAMBDA (N)  (COND  ((ZEROP N)  1)  (T (ITIMES N (FACT (SUB1 N]) FACT > The user now calls his function fact. During its execution, five errors occur, and DWIM is called five times. At each point, the error is corrected, a message printed describing the action taken, and the computation allowed to continue as if no error had occurred. Following the last correction, 6 is printed, the value of fact(3). Finally, the user prettyprints the new, now correct, definition of fact.In this particular example, the user was shown operating in TRUSTING mode, which gives DWIM carte blanche for most corrections. The user can also operate in CAUTIOUS mode, in which case DWIM will inform him of intended corrections before they are made, and allow the user to approve or disapprove of them. For most corrections, if the user does not respond in a specified interval of time, DWIM automatically proceeds with the correction, so that the user need intervene only when he does not approve.

I assume you mean to take advantage of a Hero4 Black vs. the cheaper Hero models. The short answer is no and there is a couple of compelling points why you should invest the extra money to upgrade to the Black which I´m happy to share with you.All GoPros are pretty easy to use, simply because there is not much you can change in terms of adjusting or setting the exposure. To take a picture or video you turn it on and shoot (I love the "auto-on" function that´s hidden in the options, where you just press the shutter release wait a couple of seconds for the camera to boot and it will start recording video automatically). Since it doesn´t have a viewfinder you need to get a sense of where to point the camera but thanks to it´s 180 degree field of view it´s pretty difficult to miss your target.Since you have such a wide angle view the center of the lens should always be pointed slightly down from the action. If you need a viewfinder you can invest a bit extra in a bacpac display that GoPro sells as add-on or alternatively, and I think this is an awesome feature, you can connect your smart phone and use it as a remote viewfinder and also to set settings in a much more user friendly way (this is also perfect for setting up time lapses in hard to reach places).I find the main advantage of the black to be that it can shoot 4k and that is a big deal and to me well worth the extra money even if at first you think you may not need it. Since the camera doesn´t have a zoom lens, only an extreme wide angle lens everything that is not really up close will look like it was ridiculously far away in your footage. The resolution of 4k really can help you as you have much more room to crop and apply lens-correction (to get rid of the fish eye effect). 4k resolution is so great that I have made screen grabs (taken screenshots from video footage) from a small portion of what I shot and still ended up with a usable and printable 2000 pixel jpg image.If you think cropping and lens-correcting footage is too complicated, don´t worry. GoPro has made the software and post-shooting side a major priority so you can expect some super easy to use software that will let any amateur do this within the year.That said, anybody considering buying a premium Hero4 Black should be aware that the replacement Hero5 will almost certainly come out this year. GoPro missed it´s normal yearly September to October update window in 2015, so it´s likely that they will announce a camera earlier in the year - maybe as early as March. IMHO the update will come in September at the latest.Hope this helps. Have fun shooting!