Precision Edge

A personalized finger trainer shaped to match your hand, not a generic flat edge.

Printed €49.00On-demand STL €9.00

Why it exists

Built around the idea that grip geometry influences how fingers share force, this design seeks to reduce positional bias and make loading more consistent across the hand.

What it changes

It shifts focus from total load alone to how load is distributed across fingers through posture and contact geometry.

How to use it in your training

Use it in max hangs or repeaters, either replacing or complementing standard edges with a more deliberate loading pattern. It can also be used as a warm-up tool to prepare the fingers with more balanced activation before harder efforts.

Customized edge in 3D for your hand

Made to measure

The shape is generated from your measurements in three dimensions, so the edge matches your hand instead of forcing you onto a generic profile.

01 / 05

Get yours now!

Made to measure

A 3D edge shaped around your hand.

Measure your hand once, choose your format, and we'll handle the rest. Order a finished print or get an STL generated on demand immediately after payment.

Printed version

€49.00

Physical product, made to order and shipped from Sweden.

Ideal if you want your Precision Edge delivered ready to use.

STL download

€9.00

Generated on demand from your measurements immediately after payment and delivered by email.

Ideal if you have access to a 3D printer.

Measure your hand

Printed orders ship within the EU for a fixed €9. Shipping outside the EU is currently not available.

Research-informed

Rethinking Finger Strength Training

These claims are written to reflect what the literature supports, what the product is designed to influence, and where the evidence is still incomplete.

Custom Shape Meets Biomechanics

Traditional flat edges force different fingers into different joint angles, creating a mechanical bottleneck where the least favorable finger can limit total output. By normalizing finger posture, more of each finger's potential force may be expressed simultaneously. Multi-finger research shows that maximal force is not simply the sum of individual fingers because coordination limits create a measurable force deficit, which means task geometry can plausibly influence total output.

Sources

Li et al., 1998; Zatsiorsky et al., 2000

What is not yet known

It has not been demonstrated that geometric normalization consistently reduces force deficit or improves coordination across individuals. The observed increase in total force could also arise from changes in comfort, contact mechanics, or neural strategy rather than improved biomechanical efficiency.

More meaningful intensity: Move training closer to finger-specific relative loading

In standard hangboard training, 80% of max reflects total force while individual fingers often work at different relative intensities because load sharing is stable but uneven. Studies suggest middle and ring fingers frequently carry a disproportionate share. By aligning joint angles, this tool aims to reduce structural bias and move training closer to equal relative loading across fingers.

Sources

Vigouroux et al., 2008; Li et al., 1998

What is not yet known

There is no direct evidence that equalizing joint angles leads to equalized relative intensity per finger. Neural coupling, or enslaving, may still dominate force distribution regardless of geometry.

Control internal tissue loading, not just external force

Finger injury risk depends strongly on joint angles and tendon mechanics, not just external load. Crimp-like positions can substantially increase pulley forces, and internal tendon-to-tip force ratios vary with posture. Research indicates that middle and ring fingers often approach critical pulley loads first, even when external forces appear similar. By standardizing geometry, this design may offer a way to influence internal load distribution and reduce extreme local stress.

Sources

Vigouroux et al., 2008; Dennerlein et al., 1999; Schweizer, 2001

What is not yet known

Equalizing external force or joint angles does not guarantee equal internal tendon or pulley loading. Anatomical differences and tendon routing may still produce asymmetric internal stress.

Disclaimer

This product is based on established principles from biomechanics and motor control research, but its specific effects have not yet been validated in controlled clinical or longitudinal training studies. The claims above describe plausible mechanisms and observed tendencies, not guaranteed outcomes. Individual responses may vary depending on anatomy, training history, and technique. This tool is not intended to diagnose, treat, or prevent injury, and should be used with the same caution as any high-intensity finger training.