Strop it first. Ten to twenty light strokes per side on leather with green compound, edge trailing, brings a dull #11 blade back in about a minute. If that doesn't do it, give it a few strokes per side on a fine stone or 1500 grit wet-dry paper, then strop again. And if the tip has snapped or bent, put a new blade in. X-Acto's own listing says to "change blades frequently for safer and more accurate cutting," and with blades sold by the hundred, they mean it.
Strop, sharpen or replace?
Look at the tip under a bright light, then decide. This is the call the forum threads go back and forth on, so here it is by symptom.
| What you see or feel | What it is | Do this | Time |
|---|---|---|---|
| Drags a little, tip intact | Rolled or slightly worn edge | Strop, 10–20 strokes per side | About a minute |
| Still drags after stropping | Worn edge | Fine stone or 1500–2000 paper, a few strokes per side, then strop | A few minutes |
| Tears paper at the start of a cut | Tip rolled or a burr | Strop; check the tip again | About a minute |
| Tip missing or bent | Broken point | Replace, or regrind on 400 grit, then refine and strop | Replace: seconds. Regrind: 10+ minutes |
| Nicks along the edge | Chipped edge | Replace | Seconds |
| Rust spots on the edge | Pitted carbon steel | Replace | Seconds |
The money side is simple without quoting prices: X-Acto sells #11 blades in a 15-pack dispenser and a 100-pack, so a single blade is a small fraction of a pack. Stropping is worth it because it's fast. Regrinding a broken tip usually isn't, unless you like the blade or ran out.
How a hobby blade is ground
A #11 is a flat sliver of steel with a very short bevel at the edge. That changes how you hold it compared with a kitchen knife: the spine barely leaves the stone. Raise it too far and you grind a steep, blunt bevel on an edge meant for slicing paper.
X-Acto doesn't publish a sharpening angle. A long-time modeler on Rocketry Forum puts the factory grind at about 10 degrees per side; another suggests first matching the visible bevel, then lifting the spine slightly for a small, tougher second bevel if you cut harder materials. Matching the bevel that's already there is the safest rule, and the marker trick from our Sharpie trick guide works on a hobby blade too.
Method 1: strop it (do this first)
- Leave the blade in its handle and tighten the collet. Never sharpen a loose blade held in your fingers.
- Rub green compound into the leather. The SHARPAL 204N strop kit is 8 by 3 inches, a good size for a bench drawer, and its compound is listed at 1 to 2 microns.
- Lay the blade flat on the leather, then lift the spine slightly until the edge touches.
- Pull the blade toward the spine side, edge trailing, the whole length of the edge. Light pressure: the weight of the handle plus a little.
- Ten to twenty strokes on one side, then the same on the other.
- Test on a tissue or a sheet of printer paper held by one corner. It should slice, not drag.
No strop? The rough side of an old leather belt with a little compound rubbed in is what the Flite Test article uses, with white jeweler's rouge. Our how to strop a knife guide covers compounds and technique in more detail, and the best leather strop roundup has more options.
Method 2: a fine stone
When stropping stops working, the edge needs a few strokes on something harder. A fine stone is the tidy way. A hard Arkansas, such as Dan's 8 x 2 inch hard Arkansas, is the stone modelers mention most, used with a few drops of light oil. Our Arkansas stone guide explains the grades; a 1000 to 3000 grit water stone works as well.
- Oil or wet the stone.
- Lay the blade nearly flat, edge facing away from you, spine lifted just enough that the edge touches.
- Push edge first along the stone, 3 to 5 light strokes. Turn the blade over and do the same on the other side.
- Feel for a slight burr along the edge with your thumb drawn across (never along) it.
- Strop as above to remove the burr.
Keep the fingers holding the handle off the far side of the stone. The blade is short, and a slip goes straight into the hand. Posters on both forums we read describe cutting themselves.
Method 3: wet-dry sandpaper on glass
This is the no-stone route, and the one Rocketry Forum's most detailed answer recommends. Tape or wet a sheet of wet-dry paper to a piece of plate glass or a smooth tile, which keeps it flat.
| Grit | Use it for |
|---|---|
| 200–400 | Regrinding a broken tip only |
| 600–1000 | Taking out the coarse scratches |
| 1500–3000 | Refining a dull edge; this is where most touch-ups start |
A mixed pack such as this 45-sheet wet-dry assortment from 400 to 3000 covers it. On paper, pull the blade spine first with the edge trailing, the same as on a strop, so the edge can't catch and slice the sheet. More on paper and other improvised abrasives in how to sharpen a knife without a sharpener, and the sharpening stone grit chart lines paper grits up against stones.
Fixing a broken tip
A snapped #11 point can be reground, but it takes the longest of anything here. Rocketry Forum's method is to re-point it on 200 to 400 grit: sharpen the edge near the tip at the same low angle as the rest of the blade until it meets the spine in a point again. Then refine on 1000 and 1500, and strop. It works. It also takes ten minutes for a blade that costs a fraction of a pack, so most people just change it.
Notes by blade type
- #11 (classic fine point): the one everybody means. Strop often; replace when the tip goes.
- #2 (large fine point): X-Acto lists the #2 blade as carbon steel for medium to heavy materials like wood and plastic. Its longer edge is worth sharpening on a stone.
- Excel #11: modelers on FineScale like Excel blades, and Excel's listing describes its #11 blades as double-honed high-carbon steel. They sharpen the same way.
- Snap-off utility cutters: don't sharpen them. Snapping off a segment is the design.
Carbon steel blades rust. The 100-pack listing says X-Acto oxidizes them for rust resistance, but a blade left on a damp bench will still pit at the edge, and a pitted edge won't strop back.
Getting rid of old blades
X-Acto's 15-pack dispenser has a slot for used blades, so the old one goes back in the case instead of loose in the trash. Without one, wrap the blade in a few turns of tape before it goes in the bin, which is what one Rocketry Forum poster does.
A routine that works
Strop the blade for a minute at the start of each session. Give it a few strokes on a fine stone or 1500 paper when stropping stops helping. Replace it when the point breaks or nicks show up. That's the whole system, and it means you'll open the blade pack far less often.
Sources: Rocketry Forum thread on sharpening X-Acto blades; Flite Test, "Forever-Sharp Hobby Knife"; FineScale Modeler forum, "Problems with Exacto blades?"; X-Acto, Excel and SHARPAL Amazon listings checked October 15, 2026. Forum figures (such as the 10 degree factory grind) are posters' estimates, not manufacturer specs. How we research · Affiliate disclosure