3.6LB Professional Rock Tumbler Kit with 10 Belts, 3 Speed Settings & Digital 9-Day Timer, Rough Gemstones, 4 Polishing Grits, STEM Science Kit for Adults Kids

So far so good. I was leary of the belts after reading reviews but had a backup plan. The tumbler has been running 8 days straight on the same belt now. The belts it came with were green so they possibly changed the material? The speeds are not super variable. The barrel is more flimsy than the others I own but truly this is great product for the cost!

UPDATE: I found good O-rings that replace the cheap plastic ones that come with it. Look on his site for Mr O-Ring 230. The 230 is the size you want. It's roughly 2.5 inches inner diameter, and 1/8th inch thickness. It fits well and it's made of nitrile, as opposed to plastic. However, it seemed like the tumbler is still struggling a lot with turning. The belt grips fine - great, really. When the drum isn't on the machine, the belt turns the bar very smoothly and has no issues. But when I put the drum on, it will turn VERY slowly, and then stop for a second, and then repeat.ORIGINAL: Not really a good buy. I had a cheaper one from another.. popular... site that has an orange logo and got hit by bad tariffs recently.. that lasted MUCH longer than this one. However, the motor on that one went out so I went looking for a new one. It's really just temporary to hold me until I get my vibratory tumbler in.The problem with this is that the "belts" for the motor are basically plastic. I've only tumbled ONE type of rock so far, and it was Chalcopyrite which is less than 1 day per stage, and it quit on the next set of rocks, which was agate. It would actually *start* turning, and get maybe one rotation, and quit. I turned the speed up thinking maybe it just needed the momentum to keep turning, but it didn't work. So I thought *MAYBE* I had put too many in there, so I took half out (even though that other cheaper one held *MORE* than what I was putting into this one). It still didn't work.Well, it came with about 10 "belts" (again, they're not belts, because they're basically plastic) so I tried replacing that. It worked. SO FAR, it's still going, but it does seem to be an uneven speed. The current rocks are agate, which is about 5 days per stage. That means I may need to replace the belt again before the first stage is even done! Instead, I'm going to measure the belt in a moment, and look up a better belt. (UPDATE: I have replaced it four times already IN THE FIRST STAGE on this set of rocks before finding a REAL belt that fit.)But I really don't want to buy *ANOTHER* rotary rock tumbler while waiting on the vibratory tumbler (which the manufacturer said will take about three months before they have more). So I'll just figure out a way to make this piece of crap work until then.

Great Value! For the small money they are asking, this is a great little tumbler. It has been running for a week with an overloaded barrel (well over 3.5 lbs including stone, grit, media, and water) and is still going fine. The barrel is huge, but thin walled so is a but noisy, which is no issue for me. I plan to order another one

The media could not be loaded. Seems excellent so far, and I'm ordering another one as well. I have more expensive tumblers but I couldn't pass this one up for the price - if it was garbage then I could modify or repair it, or just return it. Except that so far it's actually decent quality! The drum is fantastically large with its diameter, better than other 3lb drums I've used. It's a belt-driven unit, meaning that the drum rotation is driven by a flywheel connected by a belt to the motor. It comes with multiple spare belts, but those could be easily 3D printed in TPU or just use large rubber O-rings. Being belt-driven, the speed could be fine-tuned by replacing the flywheel with a different diameter wheel. But I don't think this will even need it. One of the biggest problems with inexpensive tumblers is that they don't tend to have a slow rotation, just fast and faster (e.g., 80RPM and higher, too fast for good tumbling). I measured the speed on this unit (full drum) using a tachometer and it is in the perfect range:Speed 1: 25 RPMSpeed 2: 37 RPMSpeed 3: 56 RPMIf I don't update this review, then it means that it's a definitive 5 star rock tumbler. I'll report back if there are any issues encountered.

I have done quite a bit of rock tumbling in the last 8 years or so. I have 2 double barrel tumblers in the style of Leegol and the larger single barrel National Geographic tumbler. While the double barrel design works very well, you have to make sure to keep the motors cool, we use a small fan. The NG tumbler works very well - no problems so far. I thought I would save some money purchasing this tumbler, but as they say, you get what you pay for. The barrel is quite flimsy and it is difficult to know if you have tightened it sufficiently. Although many extra belts are included, after a full cycle (~4weeks) the belt needed to be changed. But the worst problem is that the barrel jumps off the drive unpredictably. My tumblers are in my garage, so I might not check them daily. I lost almost 5 days of tumbling when the barrel jumped off and I didn’t check on it. It didn’t seem to matter how heavy or light the load was, sometimes it would skip as soon as I turned it on. Rock tumbling can be an expensive hobby-spend your money on a better tumbler and avoid the frustration I went through.

Six weeks and dead. The load that killed it fit into the strainer that comes with the kit. That's barely a load.

The media could not be loaded. I’ve had both the National Geographic 3lb tumbler and the harbor freight tumbler and so far this cheaper 3lb tumbler is working pretty reliably BUT I had to take the rubber barrel from the National Geographic tumbler because the one that came with this cheaper model was terrible the rubber is to soft or something it causes the belt to grind up because it get deformed and won’t stay level enough for the two rollers on the motor unit ,anyway with.a better quality barrel it works satisfactorily and a good value

Product stopped working after two months of regular use, went through four belts in that time. Belts deteriorate and make a big mess.