Thumb brace / Splint / Thumb brace

Thumb Brace – Personal 3D-Printable Model

I designed this 3D-printable thumb brace following a partial thumb tendon rupture.
It was created to meet a very specific personal need: temporarily keeping my wrist and thumb immobilized, mainly while my medical splint is being washed and dried.

⚠️ Important Disclaimer

This model is NOT a professional medical device.
It has not been designed, tested, or validated by any healthcare professional.

By downloading and using this model, you acknowledge that:

• I cannot be held responsible for misuse,
• discomfort, injury, or worsening of an existing condition,
• or any consequences resulting from its use.

If you have pain, uncertainty, or a medical condition, consult a healthcare professional.

Intended Use

• Temporary immobilization of the thumb and wrist
• Personal, short-term use only
• Intended as a backup solution when a prescribed splint is unavailable (washing, drying)

This is not a rehabilitation or long-term medical brace.

Size & Fit

This model fits an average adult male hand, with:

• a circumference of approximately 22–23 cm at the base of the four fingers,
• and a similar circumference at the base of the hand near the thumb.

For me, this version is comfortable and functional.

Customization & Adjustment

The model is easy to adapt:

• by scaling it before printing,
• or by making minor physical cuts or adjustments after printing.

Do not force a poor fit — adapt the model to your morphology.

Fastening Options

You can use:

• short elastic bands, or
• long elastic bands crossed like laces.
• Lacing
• etc.

⚠️ Do not overtighten — excessive compression may cause discomfort or restrict circulation.

Comfort Recommendation

For improved comfort, I strongly recommend wearing:

• a mesh sleeve, or
• a thin sock or fabric layer,

between your skin and the brace.
This greatly reduces friction and improves wearability.

Printing Notes

I printed this model:

• in TPU (default settings),
• flat on the build plate,
• without any supports.
  • There are 2 small holes to make cuts once printed, especially usefull to adapt forearms.

This setup worked perfectly on a Bambu Lab P1S.

Unlike many downloadable brace models, this one felt comfortable to me even without heat forming or thermoforming to the hand shape.

Summary

• ✔️ Functional for personal, temporary use
• ✔️ Prints cleanly in TPU, flat, no supports
• ❌ Not a medical device
• ❌ Not a universal solution
• ✔️ Easily adjustable
• ⚠️ Use entirely at your own risk

If you know what you’re doing, this model can be useful.
If not, don’t use it — consult a professional instead.