openSCAD Parametric cart release tool - change size of disk - or anything else - as needed, with text

thingiverse

This device is designed to replace a coin that you might use to release a shoppng cart or trolley. The size of the "coin" piece can be changed easily, as can the other dimensions. The openSCAD source is included so that you can change the size as you need to and create a new STL. openSCAD is free, you can download it in a few minutes, edit the file with your favorite editor, then preview the device until you are happy with how the handle fits to the disk - and then you can finalize it and create a new STL. See the openSCAD source for more information. Sample stl files have been included for several common coins and to demonstrate some of the capabilities. The sort of thing that can be adjusted include: - Coin Size - Coin Thickness - Handle Width at base and tip - Whether a handle is generated or not - If a coin is not round, how many facets does it have - Whether text is to be inset on the handle. - Size and font of text - Depth of text - Whether the coin is hollow or filled, - Whether or not the handle has a rounded tip with a hole in it (for attaching to your keyring). - How large that hole should be. - Whether there are cutouts in your coin outline. - Where the cutouts are positioned, including positioning them far away from your main coin so that they do not affect the output at all.| - How much the handle should be rounded. Defaults are included for many of these things. But using a different coin should be as simple as setting the thickness and diameter, and either changing or suppressing the text, and then generating an STL. Edit: I looked at some of the other shopping cart token generators to see the sort of things that they were including. I have added (1) the ability to skip the handle, and to just print a plain disk, and (2) to print a disk that just has a border. I also allow for the printing of faceted disks in case the coin we are replacing is not round. There are some example stls, but you should plan on installing openSCAD and creating your own stls. You can print a solid disk of the size you need, or a empty disk. You can print the handle with or without the keyring connector disk. Other than a carabiner, if there is anything you want me to add to this, post. Bot. I thought I would never use that trig stuff, but I am using it to position the handle - I probably calculated the length of the distance from the center to the face in the most complex way. 6/23/2017: Modifications have been made so that the "bites" are always round even out of a faceted coin. Before, the same shape was used to make the bites as the shape of the disk, that only sort of worked for coins with even numbers of facets so I was pushing the bites out of the way - and sometimes things still didn't work. Disks with 12 or fewer facets are rotated so that a flat is perpendicular to the handle so that the handle and the disk can properly match - for 13 or more facets the presumption is that the coin is "round enough" so that the handle can mate anywhere. If you don't want bites out of your faceted coin, just set the biteSideOff factor to 2, just like you would do when generating a round coin with bites out of it. The calculation of the handle attachment depth for faceted coins was simplified. I was using a correct but much overly complicated method for determining the minimum distance to a chord. Now I just use cosine. 6/23/2017 Edit 2: I added the ability to add one line of text to the handle. A sample stl file has been included to show how the text might work. Unless there is a bug or I decide to rework the headers to allow for a coin to be specified, (and I can't decide how I would do that) I am unsure about what else I can do in terms of changing this. I have what I think is a good object with almost all the features one could want - well, no bottle opener or caribiner, but if you come from someplace where no one has created a shopping cart tool for your currency, you can do so by measuring your needed coin and just plugging in values, and so forth. I probably spent more time getting faceted coins to work than any other single thing in the openSCAD code that describes the object, (since I just mostly copied the text code from another object I did) and I suspect that no one will ever use it. But if you have a square coin, I can generate a shopping cart tool for your coin, with or without bites out of it. If you do make a tool for which I have not included the measurements, please let me know the name and nationality of the coin, and the measurements, and whether it has facets or is round, and whether or not you used the cutout tool, and in what proportions. I will change the openSCAD and include a sample STL, and credit you in the object's comments. The scad preview is failing, for whatever reason, the disk is not being shown. I suspect a difference in scad versions.