Plinko Style Saving System "May the odds be ever in your favour"

Based on the 4 jar method of teaching kids to save, this model adds a fun twist. There is a direct slot to each of the jars as well as a random jar selection by use of something similar to the popular game Plinko. Let's say your child gets $5/week. They can put $1 in each of the 4 jars directly and use the 5th dollar to get a random selection of the 4 jars. If following the 4 jar method is not critical to what you are teaching your child, all coins could be entered in the random game slots…. hopefully they don't all land in SPEND. :) Have fun. 

I originally designed this on a slight angle with hopes to avoid the need for a cover, however through testing I found that the coins bounce far too much even at significant angles.  You can print the included cover in a transparent material, I used PETG, or you can use plexiglass, but the bottom edge will need to be filed on an angle (see update notes below) The cover can be tack glued in to place to keep from moving or just leave as a snug fit. 

For the ultimate mystery, you could print the cover in an opaque filament and let the games begin. 

*Designed to use the small (500ml) wide mouth jars. 

Works with coins up to 29mm in diameter by 2.7mm thickness (depending on bridge settings, this could be filed larger if needed. (Actual dimension is 3mm, but expect some bridge sagging)

You know your printer better than I do, so print with whatever material and settings you are confident with, this is what I used. 

.25mm layer height, .5 line width, 15%infill - Gyroid, no supports. This does have some steep overhangs, please ensure your printer is capable before printing. My overhang settings are 40,25,10,10. This is a large print and will take several hours, I suggest you cut the model in to quarters and do a test print to ensure your overhang settings will work. You may be wondering why the slot has a coin shoot underneath, this is purely to act as a support for the large overhang and quickly reduces the size of the overhang diameter allowing for better printability. 

I used ABS and it printed beautifully. You can print in single colour or set a pause to change colour before pegs start printing (end of layer 12, before layer 13 when using .25mm layer height). MMU can be used as well, just paint on the colours you like. 

Please post your MAKES, I'd love to see how the 4 jar system is working for you and your family. And “May the odds be ever in your favour” .

UPDATE: After printing the cover plate and testing various coins, I found the largest coin I had (Canadian Toonie) would catch on the bottom edge of the “Save” and “Spend” slots. I have updated the cover to include a draft angle to allow the larger coins to pass through more easily.