3D-Printed X-Acto #11 Blade Cap, Tuned Design

Design preview. Rendered from the file, not a photo.

The maker says it fits: X-Acto #11 knife blade. See the proof

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What it does

Won't roll on slanted work surfaces so your blade stays safe and within reach
Wider blade slot fits third-party blades with different sizes, so you work with what you have
Reinforced edges resist breaking from layer separation, so your cap lasts through heavy use
Tapered curves guide blades in smoothly, so you cap your knife faster and safer

Your hobby knife stays sharper and safer when it has a cap that actually fits right. This 3D-printed cap replaces flimsy covers that break or slip off your X-Acto #11 blade. You get a design that holds firm without rolling away on your workbench.

The blade slot is wider than standard caps so you can use third-party blades that don't match X-Acto tolerances exactly. Reinforced edges around the tension slot resist the layer-line splits that wreck cheap caps. Tapered curves make sliding your blade in smooth and quick. Prints easily with no supports or rafts needed, so you can have a working cap in hours from the US.

2.5k downloads in the maker community. That is interest in the design on the site it came from, not our sales.

What it fits

The maker says it fits: X-Acto #11 knife blade

That is the maker's word, not a fit we measured. Check the size below against your own.

X-Acto #11 knife bladeFrom the maker's own listing title, checked 2026-08-13. See the original post

Brand names here only say what this part fits. We are not connected to those companies, and they did not make or check this part.

What you get

This design prints as one piece.
Nothing else to print or buy for this to work.

What it is made of

Designs like this print well in PLA. Compare the materials.

Printed plastic is strong for its size, but it is not metal. We have not load tested this design, so we do not publish a weight rating. Keep it out of a hot car and away from open flame.