There is a guy on youtube from up there somewhere named AVE. I think he gets cheap tools from a place called Princess or princes? I think its the usa version of harbour freight. Do you have that there?
I use simplify 3d. I tried cura but didnt have as good luck with it. I have not tried slic3r. The STL was made in tinkercad. I think it can output other file types. I am having trouble loading the page on this old PC im currently using. There are like 3 or 4 carriages on this page, i forget which one is the finished one. https://www.tinkercad.com/things/5XfdACUlxHk-hypercube-evolution-x-carriage-and-y/editv2