This is one of my first model, which i made for exploring possibilities of 3D-printing during my learning 4 year ago. It's work properly, but designed without enough knowledge about optimization for printing - that's why you may have some problems with assembling of this model - i'm sorry)

Synthesis of gear engagement was done in KOMPAS-3D (popular russian CAD software). Gear ratio - 1:30

Recommendations:

• I recommend to turn on "slowing-down for overhangs" setting and choose “inner-outer" perimeter order in your slicer for worm gear. This detail is also needed vertical orientation on the printer table
• For best results I recommend to use for assemble cyanoacrylate glue or solvents for your filament (like acetone or dichlormethane)