Mô hình hộp số Constant Mesh Two Speed Gearbox

In this type of gearbox, all the gears of the main shaft are in constant mesh with the corresponding gears of the countershaft. A sliding dog clutch is provided on the main shaft.
Gear ratios 0.75, 1.33 and neutral.
This model was designed in Tinkercad.
3-speed gearbox with reverse gear : Constant Mesh 3 Speed Gearbox with Reverse Gear by Bootjevaarder | Download free STL model | Printables.com
 

Printing and Assembly
The parts should be printed on a smooth build plate, not textured.
If possible, avoid elephant foot.

I printed the model on a PRUSA MINI, with PLA+ filament, layer height 0.15 mm. 
I use Hard Plastic Glue where necessary.

For assembled and exploded views, use .stl files A0… X0… (do not print).
Printing and assembly in alphabetical order (A1 → X1).

Choise between Spur and Herringbone gears (A4 B2).

Dimensions:  95 x 63 x 101 mm.
Weight:  0.1 kg.
 

Join gearbox to “4 Stroke Flathead Engine” (= 135305)
Print parts X1 → X5.
4 Stroke Flathead Engine by Bootjevaarder | Download free STL model | PrusaPrinters

To couple the gearbox to the engine, the “Cranked Handle” of the engine must be removed.

The engine, coupling bracket and gearbox click into the “X1-Sled”.
Important: Part “X2-Coupling Bracket” must be assembled in the correct orientation (ARROW).

Operation
Use the cranked handle to rotate the gearbox / engine.
To couple / uncouple the gearbox from the engine, use “X5-Coupling Selector Fork”.
For shifting gears, use “A3-Selector Fork”.