Stackable disposable mixing tray with spatula

Here's a remix of a clever disposable mixing tray.  The original was 1x2 inches - quite small, and for my big hands too small to hold.  Then I made it stackable, and more compact form factor by shortening the mixing stick. 

Mix up paints.  Mix up 2-part epoxy.  Or use the tray as a small parts tray.  The gridfinity gang will love the square form factor and stackability.  

Printing - the model provided will print 4 trays.  Don't worry, they stack so you can put them on a shelf or in a box and take out one when you need it.  They're 2 x 3 inches (5cm x 7.5cm) so are good for a decent pot of paint or epoxy for a small project.  The attached spatula can easily be snapped off and used, and stays secure while separating from the plate and still allows the trays to be stacked.

I printed mine in PETG - the settings are already provided in the provided prusa slicer project (.3mf file).  It's not an STL - as there are multiple parts to the model.  This approach lets you choose when you slice whether you want spatulas or not - just delete the parts you don't want to print.  Want the spatula but not connected?  Delete the connectors and slice.  Don't want the spatula at all?  Delete the connectors and spatula and slice.   Want more on a tray?  Just increase the instance count.

I used PETG because it is solvent resistant and will work with any paint or epoxy out there.  You choose what you like.  Recommend 0.2mm layer height, but slices fine at 0.25 or draft mode.  Print in speed profile recommended as no additional benefits from using structural profile for this item.