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As the name implies, I'm looking for ways to smooth out the bottoms of resin bases that a bit of the bottom sticking out and need to be sanded down.

I have noticed alot of professionally done bases have a circular but flat groove on the bottom of their bases, as if done by a circular sander. Could this be an affordable option here?

Sand them down, the majority of the time I do it by hand with a sheet of medium grit sand paper. Simply put the paper on a firm flat surface and rub the bottom of the base in a circular motion over the paper.

If I had to do a large number of bases I'd either throw them on the band saw it they were that uneven or I'd break out a belt sander.

Would that said would I go out and buy specific equipment to do it other then a few sheets of sand paper? No, no I wouldn't.

Belt sander would be a viable option. Wear a mask , even if it means pulling a t shirt over your face.
Underfill of the mould will give curved outer rim, overfill will have a bulge in the middle.
Belt sander would work for both, as would skidding it across some 100 grit sandpaper.

+1 When the bases I cast from resin get a bubble-top from overpouring or expansion, I bust out the sandpaper and face masks. Do it outdoors and keep a fan handy to blow the dust elsewhere.

I'd suggest gluing the sandpaper to a piece of glass and running the bases in a circular or figure 8 motion, as opposed to running the sandpaper over the bases. This way they will be flat, no low/high spots from uneven pressure.

For mass production I've used a skid over a belt sander, essentially a box over the top with enough clearance to avoid being sanded and to expel shavings. A lid on this, as simple as a spare chunk of wood for weight, ensures the pieces won't flip and scuff the tops.

Just an open face box with two sides that keep it up off the table the sander is attached to.

What I do is I put a release agent on a CD jewel case. and after 1.5 mins of the 3 mins cure time (the air bubbles finish coming up and it starts turning white). I place the CD jewel over the part I want flat. I place weight on it. I usually use the resin container as the weight. This gives me the flat surface with out sanding. Depends on the pour but most of the time I only have a few bubbles to fill with GS.

Ordinary flat files work best. The one in the pic has fine teeth for metal but get a really coarse one for plastics/resin or the teeth will plug up. This should be in everyone's modelling kit (along with various shaped mini files)