Linear actuator - TT motor

This 3D-printed project transforms the rotary motion of a small TT motor into a reciprocating linear movement using a simple crank and slider system.
It’s a great demonstration of mechanical motion conversion — ideal for educational use, motion displays, or small DIY automation projects.

I also added a base specifically designed to support the vertical tower, allowing it to clip into place without any screws. This base provides stable positioning and ensures perfect alignment of the tower with the mechanism. The tower is designed to guide the items being dispensed. The small 3D-printed gift boxes, which can be opened, make the system fully functional by allowing the device to operate as an actual gift dispenser, with smooth and repetitive motion driven by the crank–slider mechanism.

It can also be used together with conveyor belts.

Features

• Simple crank–slider mechanism driven by a TT DC motor
• Smooth reciprocating motion with adjustable stroke length
• Snap-fit or glue assembly for easy construction
• Compact and modular design (no bearings required)
• Perfect as a small linear actuator or mechanical demo

Assembly

• Connect the motor shaft to the large wheel (crank)
• Snap-fit or glue the linkage arms as shown in the exploded view
• The slider fits inside the main body — fix with small screws or glue
• Ensure all joints move freely before powering the motor

Printing Settings

• Material: PLA OK - You can tested with PETG
• Layer height: 0.2 mm
• Infill: 15–20 %
• No supports required
• Bed size: Compatible with  A1 MINI

Components

• 1× TT Motor (DC 3–6 V standard yellow gearbox motor)