I too have thought about having a 3d printer. What does the plastic cost to print something like those little organizing bins?
Great question...and something that is actually possible to determine without a printer!
So 3D Printing Crash Course:
Someone designs/creates a model of something they want to print and then generally saves it as a .stl file type
A "slicer program" imports that .stl files, allows users to make settings changes/tweaks related to how they want it to print(not to the actual model), then when ready "generates" the code(G-code) for the printer to actually use to print.
The great thing is that there are sites specifically to share files(thingiverse.com for example) and the slicer programs are generally free! 2 popular and common ones are Cura and PrusaSlicer, so with a slicer program and a file you can play some yourself!
Without the exact file for the bins can't say exactly what THOSE bins cost to print...but a similar bin found below:
https://www.thingiverse.com/thing:569241
Using the "Small Tray" file specifically, which is approximately 2" x 1.5" x 1.75" tall
When run thru PrusaSlicer, it says would be 14 grams of filament and roughly 1 hour of print for (1), see attachment for a screenshot where I circled the filament usage estimate. I would print this in PLA which a quality spool(1kg or 2.2lbs) is generally around $20-$22 on Amazon so you should be under 30 cents in filament cost per bin.
You can put multiple parts on the print bed at a time as long as they fit and you can gain some speed there, looks like on this should be able to nest (20) of them on a Prusa and would be a 11.5 hour print time which is approximately half the time per bin vs printing a single bin