The iPower leaf bowl trimmer is a good non-electric bud trimming machine, at an affordable price that can save you 80% of trimming leaf trimmer machine time. This manual operation unit comes with two adjustable blades, the wire blade is for dry buds and the flat blade is better for wet buds.

How it trims buds: The rubber fingers tumble buds while the blade trims the bud leaf that passes through the metal grate. Simply remove the top, place untrimmed buds on the grate, close it and rotate the handle clockwise for about 15-30 seconds. Remove the top again to reveal the trimmed buds. Leaf is caught in the lower section of the machine. Simple & easy to clean.
It’s worth it if you use it. Small harvests don’t need much more than a pair of scissors and a few hours of work. Once you are harvesting more than you can deal with, using a handheld trimmer or compact machine starts to becomes helpful. Bud trimmer machines cut down on the time it takes to deal with those not-so-fun to trim buds, especially the lower end “pinchy” buds. You can still manicure the tops by hand if you please but send the pinchy buds to the machine to get it done and forget it.

Many growers get sore and tired of trimming electric leaf trimmer by hand so they buy a bud trimmer machine to do the work for them. Even the small cheap bud trimmers can speed up the time of harvest. The tabletop tumbler machines make it so easy that all you have to do is break down buds and load them in.
When buds are rolling around inherently there’s going to be some trichome damage. All we can do is try to minimize it. The machines that use non-stick tumblers are less abrasive than the bowl trimmers, and process bud in less time. Adjusting the blades of a bud trimmer machine too close may slice off pieces of bud.

As far as handheld bud trimmers go the Wander Trimmer is called the “no-damage bud trimmer” – it only cuts the leaf that gets sucked into the wand. The Speedee Trim on the other hand is open-faced so it’s up to the operator to Leaf Trimmer make the right cuts.