It would be incredibly useful if I could print my own gearing solutions, even if I have to print the gears one at a time. However, I do not know how the market's cheapest printers will accommodate this task.
--The gears need be 2-3 inches in diameter, and they will bear only a very light load (much less than 1 foot pound), so the material need not be strong or machinable.
--The tolerances need only be sufficient for the teeth to mate robustly, preventing any hang. Unfortunately, I do not have a sense of what tolerances will allow gears to mate properly.
--(If the machine is precise enough to print a hole to statically mate with a shaft of a specified dimensions due to friction, excellent. If not, I can probably improvise a tiny shaft hole with adhesive.)
--Because this may be used in close proximity to pavement, a melting temperature in excess of 100F is desirable but not required.
--Because any given element will interact kinetically only with other elements that have also been 3D printed (except a metallic shaft), compatibility with external resources is not required.
I would be grateful to anyone who could shed some light on this issue!