Mini 4wd ramps are complicated. Printing it in a single model involves a lot of supports and can be messy. If it were modular then you could use standard track sections as the ramp and just have supports to hook them together. This is a set of files to do just that. All files are designed to fit on a 250mm cube printer. the supports are designed to have a 250mm single lane track section between each support section as the ramp bed with the exception for between the third and the final return to flat angled support. that is designed for 150mm track section, otherwise the final upper level would exceed 250mm. This set supplies all files needed, the 250mm and 150mm single lane track, as well as files for a lower level track sections which are 246mm and 147mm due to how triangles work :) There is a lower ramp brace that can be used if you don't want to have a lower layer track. There are also solid versions of the supports in case you don't want a lower track. however they still have the track locks in case you wish to use the braces.