Summary

Yet another coin fidget spinner. This one is a somewhat larger two arm version.
The centre hole is for the standard 608 skate bearing, 22 mm × 7 mm.

There are a few ready-made STLs there, for coins i had lying around:

six 50 euro cent coins
eight UK 5p coins
eight 5 euro cent coins
eight 1 角人民币 (1 Jiao RMB) coins

(I did print all of these, but for the photo session could find only the one.)

How I Designed This

This is slightly parametric. Whit a bit of work you can use your favourite coins, either local currencies, or parts of that little pile of foreign currency that travellers tend to collect. For that i have included the FreeCAD file. It includes a spreadsheet called “sizes”. To get a new spinner, do this:

Download FreeCAD and get it running
Load the yacs_2_arm.fcstd FreeCAD file
In the tree view, double click on “Sizes”. You should see the spreadsheet
Measure your coin or look up its size (Wikipedia, search engine, &c.)
Put in the diameter and thickness in B6 and B7. Make sure to keep the = and mm.
Check that you have enough coins. The spreadsheet shows the number needed. Typically 8, 6 for thicker coins like 10 euro cent and up.
Change other values in the “B” column, like the whole spinner’s size, to taste.
Go back to the yacs_2_arm view
Check that the shown shape looks OK. There are view controls at the top
Check that in the tree view there are no exclamation marks as warnings
If there are problems, it’s easiest to close without saving and to try again. Change fewer values, and only by small amounts.
If the spinner looks good, select the last item, “spinner”. It should turn green in the main view.
Look for the dropdown in the tool bar and select “Mesh Design”
You should now have a “Meshes” menu. Select “Create mesh from shape …”
I have to select the “Standard” radio button. “Mefisto” produces empty meshes.
Click OK
There should be a “spinner (Meshed)” item in the tree view. Select it.
Click on the “Export a mesh to file” icon, enter a file name, select the file type (STL or OBJ) and click “OK”,
Et voilà, you’re done. You have finished your first FreeCAD lesson and can now go ahead and slice and print your customized spinner.

There is also some design history available at my github repo.

All my “yacs” spinners are related and started out with the same bearing ring.

yacs two arm largish coin spinner