Every question, answered.

That's the surface it's built for. Hard, flat surfaces are where the wide base and the fin grip work at least as well as anywhere, holding a drink steady against machine vibration and stopping a bumped cup from sliding to the edge.

That's exactly the vibration it's built to resist. The base grips the tabletop, the fins hold the cup by its bottom inch, and the flex settles it back level between seams. It resists tipping — it's not magic, so a hard direct knock still lands like one.

Measure the base, not the rim. A base 2 to 3 inches across settles in — the 40 oz tumbler does. Handled mugs don't; the handle lands where a fin needs to grip.

Reasonable — quilting cotton absorbs instantly and a stain can wick across hours of piecing. This resists tipping and settles the drink back when the table shakes or a quilt sweeps past. It isn't a sealed cup, so keep a lid on at the machine if you want a second layer of insurance.

No. Nothing clamps to an apron, a drop-leaf edge, or a lip — it just sits on top of whatever surface you're at, so a cabinet with hardware in all the wrong places isn't a problem.

Yes — that's the bouncing-table scenario it's built around. A table-mate's pedal shaking an eight-foot folding top is exactly the kind of shake the base is designed to shrug off, whether or not you're the one sewing.

Yes — the padded cover is a softer surface, similar to a mattress or duvet, and the wide base rides that give instead of tipping on it. It's a good spot for it, since the board is often the only 'clear' surface within reach of the chair.

Keeping the drink off the fabric is the whole point — it sits on the table in its own footprint, not balanced near the yardage, so a sweating glass condenses onto the base instead of the fat quarter next to it.

Rinse it or run it through the dishwasher. It's one piece of flexible material with nothing built in to trap thread lint.

It's called the Steadi. Steadi Labs molds it in small runs in Orange, California — veteran-founded, patent pending — and every order ships free from steadilabs.com, with 30 days to send it back if it doesn't work out.

The grip range is the problem before anything else — a typical clamp opens across only about 0.5 to 2.5 inches of straight edge, and a sewing cabinet offers an apron, a drop-leaf hinge, and a rounded lip instead of a clean edge to bite. This doesn't touch the edge at all. It sits flat on the machine table, the cutting mat, or wherever the cup already lives, so there's no edge thickness or shape to match first.

A suction seal needs a smooth, non-porous, flat surface, and it only protects the one cup it's built into. A sewing space is never without thread lint and fabric dust settling onto every surface, which is exactly what breaks a suction seal — and it has nothing to offer a padded ironing board, a textured cutting mat, or a tablecloth at retreat. This grips the outside of whatever container is actually in use instead of sealing to the table underneath it, so it works the same across all of those surfaces, with any drink.

Yes. The base doesn't rely on texture to grip — it holds the acrylic extension the same way it holds the machine table beside it, through its own footprint and the fins closing around the container, not through the surface underneath being rough. That matters most right there, since the extension's narrow margins on every side leave less room for a cup to drift before it's off the edge.

No. The fins hold by mechanical grip around the container, not by suction or an adhesive pad, so dust settling on the base doesn't break a seal the way it would on suction mugs. It rinses off or runs through the dishwasher, and there's no spring tension or sticky pad underneath to wear out the way a clamp's spring or a suction cup's seal do over months of sessions.

One per drink, with nothing to coordinate between them. Each base holds its own container independently, so a second one at the cutting table works exactly like the first one at the machine, with no shared mount or single clamp point to compete for.

It packs flat into a project bag alongside the notions, needs no setup, and answers a problem most sewists already manage around rather than mention out loud. It ships free, molded in Orange, California, with 30 days for her to decide it earns a spot at her own machine.

A standard 12 oz aluminum can measures about 2.6 inches across its base, well inside the 2 to 3 inch range that settles in fully. The Stanley 40 oz H2.0 FlowState Quencher Tumbler runs wider, at 3.1 inches — inside the fins' 3.15-inch flex ceiling, so it seats with a firm push instead of dropping in loose.

Not the largest ones. A Nalgene 32 oz Wide Mouth measures about 3.5 inches across its base and a Hydro Flask 32 oz Wide Mouth runs about 3.58 inches — both past the fins' 3.15-inch flex ceiling. A narrower bottle in that same retreat-bag category, or something like the 24 oz Owala FreeSip at 3.12 inches, seats with room to spare or a snug push.