HO/OO/on30 model train engine Power Bogie

This is a 3D printable HO/OO/on30 power bogie chassis that is simple to assemble, inexpensive and can be customised to power a variety of printable model engines.

All parts are sourced from AliExpress:

Worm Gear
6*6mm 1.5A Worm Gear, 1.45 ID (2 required)
https://s.click.aliexpress.com/e/_dY80FNr
or
6*8 1.5A Worm Gear
https://www.aliexpress.com/item/32862948918.html?spm=a2g0o.productlist.0.0.3f32314dH1exq0&algo_pvid=9447f319-1e33-4222-8b87-72f7d4b35863&algo_expid=9447f319-1e33-4222-8b87-72f7d4b35863-3&btsid=0be3764515826281277652479e9bda&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

Drive Gear
152A 0.5M Spur Gear, 15 teeth, 2mm ID(2 required)
https://s.click.aliexpress.com/e/_d65sEId

Copper Bushing (4 required)
ID 2mm x OD 5mm x W 4mm
https://s.click.aliexpress.com/e/_dWL9r82
or
https://s.click.aliexpress.com/e/_dWiFp4H

Wheels (2 required)
1:87 Universal Wheel DC
https://s.click.aliexpress.com/e/_dY7Fj3g
or
https://s.click.aliexpress.com/e/_dTAWRJ7

Motor
12V 030 Micro