Designed these tires for my Losi 1:24 scale Micro Rock Crawler using NinjaFlex filament. These wont work on the stock wheels so I'm including a 5-spoke wheel in both single and dual colors. This setup extends the total width ~5mm wider then stock. Enjoy! Here's a video: http://youtu.be/CT5fsnbpkbI For me, using a Makerbot 2X I was able to print the tires using these settings: Infill = 3% Shells = 2 Layer Height = .30mm Important: For the tire to print properly, it was critical that I set the "Speed while Extruding" setting to 35mm/s. This setting is under the Speed tab in MakerWare.