15mm motor bogie for Pauline Type 2 from Atlas Editions

This is the motor bogie used to power a Pauline Charentaise Type 2 railcar from Éditions Atlas. A video with a more complete explanation can be found on YouTube: https://youtu.be/aV4nGZgCHQ4 Its short wheelbase necessitated a new design with the motor inclined at 45°, transmitting power to a single axle. The other axle is simply a load-bearing axle and sensor. This requires two motor bogies for optimal traction. Each bogie consists of a chassis, a protective casing, and a support arm that connects to the chassis. This arm has a 3-degree incline to increase the support of the motor axle and improve traction. Caution: Due to its pivot point, the more ballast is added to the railcar, the more the motor axle will tend to lift, causing wheel slippage. To correct this, the arm has an angle, and the more ballast there is, the greater this angle needs to be. That's why there are three arms with angles of 3, 4, and 5 degrees. The one I put in my Pauline has a 3-degree angle because I only have 5 grams of ballast at each end of the body. There's also a straight attachment without any angle. I also added a bogie fairing that replicates the side of the bogie from the Pauline Atlas. It simply attaches to the axle ends (see the video). The parts shown in the photo were printed in standard PLA on a Bambulab A1 Combo with a 0.2mm nozzle and a 0.1mm layer height. It's possible to print with a 4mm nozzle, but print quality is crucial as it will determine proper operation. Indeed, everything is very precise, and even a tenth of a millimeter more or less will cause problems. The assembly and testing procedures are described in the YouTube video, which you should watch first. For the parts to be strong, it is necessary to print them with 100% infill, especially for the support arm and on the chassis around the ball bearings that click into their housings. With a standard 15% infill, I broke several... Supports are needed for the bogie body. Supports aren't necessarily needed for the arms. 🚩 List of necessary supplies: Ball bearings: 2mm inner diameter – 5mm outer diameter – 2.5mm width (ID2x5x2.5) https://fr.aliexpress.com/item/1005009062156404.html Evemodel C8721 axles https://fr.aliexpress.com/item/1005004848445398.html Worm gear: 6mm long – 6mm diameter – 1mm hole, 0.5M pitch (6x6mm x 1mm) https://fr.aliexpress.com/item/1005006619769641.html Gears 10 teeth – 2mm shaft https://fr.aliexpress.com/item/1005006619769641.html N20 motor https://fr.aliexpress.com/item/1005001395013074.html Gear extractor https://fr.aliexpress.com/item/1005007498674708.html Power pickup strips: https://www.ebay.fr/itm/140943734843?_skw=lamelles+jouef