MoneySpinner

thingiverse

I liked CarryTheWhat's spinner toy, which they published here:http://www.thingiverse.com/thing:1871997\nBut given that roller bearings can be scarce, I wanted to use some mass more readily available. I also wanted some practice developing 'if...else' loops in OpenSCAD.\nSo I present MoneySpinner, a collection of spinner toys using appropriately sized and globally available coins as the spinning mass. \nDepending on your country, you can download an STL that uses readily available coins, which press fit into the holders. The STLs have the coin type followed by the number of spokes in their filenames.\nThe OpenSCAD file caters for between two and seven spokes and the following coins:\nAustralian $2\nUS 10c (dime)\nUK £1\nUK 5p\nEU €1\nUS 1c, and\nUS 5c (nickel).\nI have now uploaded the scad file into the Customizer. Please tell me how it works out for you. Additionally, I have uploaded a selection of STLs to cater for most people's desires. \nMost options accommodate two coins in each 'stack'. When using AU 5c, US 10c and UK 5p, three coins per stack can be fitted. I have sourced the dimensions (diameter and thickness) from reliable sources on the web but if you print one of these and have major problems fitting the coins, please provide me with feedback.\nI have also used aubenc's excellent knurling function provided by their library here:http://www.thingiverse.com/thing:32122 \nUpdate 9: I added the 6902 bearing option, which is a larger bearing with a 28mm outer diameter. There are also STLs for a hub for this bearing.\nUpdate 8: '1' as an option for 'number of spokes' is now available for an out-of-balance spinner.\nUpdate 7: I finally got the hub designed and uploaded.\nUpdate 6: Bugfix - US Nickel is now correct for three coin stacks.\nUpdate 5: Orbits! The customizer now offers orbits as an option for increased strength and good looks!\nUpdate 4: US 1c was added, and Qatari 50 dirham was deleted to keep menus simple. \nUpdate 3: Now includes a smooth edge option for those with soft fingers! Look for the three-spoke US 5c STL and the Smooth option in the Customizer.\nUpdate 2: I deleted the CR2032 option, as requested. Instead, there is now a US 5c (Nickel) option, which assumes stacks of four. Tell me if this doesn't work - it seems like you'll need long fingers!\nUpdate 1: I have printed a number of these now. Tolerances are fairly tight, but an Australian $2 fits well, and the 5 cent coin has a tendency to break through one or more ring as three coins are pressed in. My solution has been to scale the STL up by 100.5% in Simplify 3D when I make my gcode. 101% made the bearing a bit loose. Your mileage may vary.\nPrint Settings\nPrinter Brand:\n Printrbot\n \n Printer:\n Simple Black\n \n Rafts:\n Doesn't Matter\n \n Supports:\n No\n \n Resolution:\n 0.2mm\n \n Infill:\n 20%\n \n Notes: \n I use a raft to ensure adhesion without a heated bed, as these are only several millimeters thick and it is essential to ensure they remain attached throughout the print.\nHow I Designed This\nI designed this using OpenSCAD. The current code incorporates switches that select the number of spokes (between 2 and 7) and the coin type by name. The dimensions of individual coin types are hard-coded and selected automatically through an if...else sequence.\nA 'spoke' is built using a knurled disk of appropriate dimensions with a void, attached to an 'arm' which is proportional to the coin diameter.\nThe length of the spoke depends on the dimensions of the coin and must be able to be spun between a thumb and finger without hitting the web in between. I think a €1 coin, which has a diameter of 23.3mm, may be too big for many people.\nThe spoke is then rotated by the appropriate angle using a for() loop, and attached to a hub that is appropriate for a standard 22mm rollerskate bearing.