Finger exerciser

The device is intended for use with custom-made weights of varying heaviness. Alternatively, other types of weights can be used if desired.

The exercise device can help with recovery after injuries or a stroke. 

1. For the 4-finger exerciser, you will need:

 1) 3D-printed parts:

•   Base - 1 pc.

•   Pulley - 4 pcs.

•   4 mm bushing - 2 pcs.

•   9 mm bushing - 2 pcs.

•   25 mm bushing - 2 pcs.

•   Weight hanger - 4 pcs.

•   Retaining ring - 4 pcs.

•   Velcro fastener/holder - 4 pcs.

 2) Purchased materials:

•   625 bearing - 4 pcs.

•   M5 threaded rod (135 mm) - 1 pc.

•   M5 nylon-insert lock nut - 2 pcs.

•   Double-sided Velcro strap (10 mm wide) - 4 strips, 90 mm each (length can be adjusted based on finger thickness).

•   Cord (50 cm) - 2 pcs.

•   Cord (80 cm) - 2 pcs.

•   Self-tapping screw - 4 pcs.

2. For the thumb exerciser, you will need:

 1) 3D-printed parts:

•   Thumb base - 1 pc.

•   Pulley - 1 pc.

•   9 mm bushing - 2 pcs.

•   Weight hanger - 1 pc.

•   Retaining ring - 1 pc.

•   Velcro fastener/holder - 1 pc.

 2) Purchased materials:

•   625 bearing - 1 pc.

•   M5 threaded rod (55 mm) - 1 pc.

•   M5 nylon-insert lock nut - 2 pcs.

•   Double-sided hook-and-loop (Velcro) tape, 10 mm wide – 1 piece, 100 mm long (the size can be adjusted based on finger thickness).

•   Cord, 50 cm – 1 piece.

•   Self-tapping screws – 2 pieces.

3. For the weight, you will need:

 1) 3D-printed parts:

•   Weight, 10 mm (or 20 mm / 30 mm) – 1 piece.

•   Weight cap – 1 piece.

 2) Purchased materials:

•   Steel or lead shot – quantity as needed.

4. For the support cradle (cradle mount), you will need:

 1) 3D-printed part – support cradle – 1 piece.

 2) Purchased materials:

•   Webbing strap, 25 mm wide – 50 cm.

•   3-slot buckle or 25 mm side-release buckle (trident-style) – 1 piece.

•   Self-tapping screws – 2 pieces.

5. You will also need a sheet of laminated chipboard or plywood to mount the components of the training device.

Assembly recommendations:

1. 3D-printed parts should be made from PETG or PLA.

2. For a 4-finger training device, alternate the cord lengths between 50 cm and 80 cm.

3. When filling the weights with shot, use a scale to ensure each weight has the same mass.

Mark the weight value on the body of each unit using permanent paint or a marker.

4. Secure the bases and the support cradle to the sheet of laminated chipboard or plywood using self-tapping screws.

Position the components relative to one another based on the dimensions of the hand being trained to ensure proper ergonomics.

The laminated chipboard or plywood sheet can be secured to a table using clamps. 5. A strap for the arm support (cradle) is attached whenever it is necessary to secure the arm. The strap is fastened in place using the same screws that secure the arm support itself.

Special slots and recesses are provided in the arm support to allow the strap to be threaded through.

A three-bar slide (tri-glide buckle) or a side-release buckle (fastex) is used to adjust the length of the strap.

In any case, this device is not a certified medical device! It cannot guarantee progress in treatment.