Yarin’s Blowing Trainer

Yarin’s Blowing Trainer is a breathing practice tool designed for Yarin, to support early speech development through controlled exhalation. The device provides a chin rest and a clear grip to improve posture, guide airflow, and enable safer, more independent practice with less hands-on assistance from an adult. The project went through multiple prototypes, real-life testing, and durability improvements for everyday use.

Tools and Equipment

1. Drill
2. Drill bit (3.5mm, 4mm)
3. Hole saw (32mm)
4. Phillips screwdriver
5. Blower/ Heat gun
6. Soldering iron
7. Lighter
8. Small plier
9. Wood glue
10. CA glue

Materials and Supplies

1. Birch plywood (18mm 150mmX500mm)
2. steel pipe (32mm 250mm)
3. PETG filament
4. TPU filament
5. PVC rod (30mm X 1000mm)
6. C clamps X2
7. Saddle clamp (31.8) X2
8. Pan Head Phillips Screws (M4X20) X6
9. Hex Head Screw (M5X16)
10. Heat Staking Inserts (M4XH8) X4
11. Hex nut (M5)

3D-print the parts (recommended orientation as shown in the picture) using PETG filament, then remove the supports using small pliers.

3D-print the parts (recommended orientation as shown in the picture) using PETG filament, then remove the supports using small pliers.

3D-print the Chin pad using TPU filament, then remove the supports using small pliers.

1. Cut the plywood to the dimensions shown in the drawing
2. Glue the piece to the end of the larger board with a Wood glue
3. Drill 32 mm holes in the wood at the marked locations using a hole saw
4. Cut the metal tube into 53 mm-long pieces
5. Press-fit the tubes into the holes in the wood

1. Cut the PVC rod into two 37 cm pieces.
2. Place the cut piece on the jig, pressed against the glued wooden block.
3. Heat the bend points with a heat gun, then bend the PVC rod over the jig
4. Repeat until the rod is firmly stuck in place, then leave it there until it cools down

**Repeat this step twice.

**Be patient with the heat gun and keep it at a safe distance from the PVC.

Drill a 3.5 mm hole in both ends of the PVC rod.

**Repeat this step twice.

Drill a 4 mm hole in the C Clamps.

**Repeat this step twice.

Install heat-set inserts using a soldering iron

Insert the C-clamps into their designated holes and screw them in using 2 M4 screws.

Push the Saddle clamps into their designated slots with the lever facing outward

Install heat-set inserts using a soldering iron

Insert the Hex nut into its designated hole.

Attach the chin pad, then press the snaps into their designated holes.

Heat the M5 Hex screw head with a lighter, then press it into the screw handle.

**If it doesn’t hold, use a strong adhesive instead.

Insert the straw from the outside and make sure the rail faces upward. Attach the straw lid to the drain opening, then tighten the screw with the handle to clamp the straw in place.

Glue the two mouthpiece parts together with the CA glue.

Screw the mouthpiece into the straw.

Push the PVC rods into the designated holes at the bottom of the chin rest mount. Screw the M4 screws through the inserts, then cover them with the screw caps.

Insert the PVC rods (with the chin rest mount attached) into the base. On the other side, attach the rod end caps using M4 screws.

1. If you’d like to use the same whistle we used, you can 3D-print it from the file here.
2. We also included the adapter file that connects the whistle to the rest of the device.