ITEMS NEEDED: 1.75mm filament, 2mm ID 4mm OD flexible tubing (both easily found on amazon) .This is a basic track crosstie for a Vekoma style coaster, whether it would be a boomerang, slc, standard sitdown, this works for most of vekomas older coaster models. To build a complete coaster, you might need up to 200 - 250 crossties, but only print them as you go to prevent waste. To start off the rails, use the 1.75mm filament, inserting them into the two smaller indents on the bottom should be no problem, snapping it in or sliding it in should work if the quality of the print is good. After assembling as many of these as you printed, you may slide or put on the tubing onto the top of the track. Note that this might not stick entirely at first but with some hotglue or a simple 3d printed harness for it, it should stay on the crosstie easily. at this point, you may cut off the extra filament or tubing, or continue printing crossties for a longer piece of track. From here you may twsit, turn, or bend the track in any direction you like. And with the trains for the coaster which will be a classic vekoma slc style train, it will run smoothly as long as you keep the inner side of the crosstie clean and clear of all residue, stringing, or bumps. I will also be working on support structures for the coaster itself. Feel free to modify it to your needs, upscale it if you want a more realistic model, but upscale it too much and filament no longer works, so tubing will have to be used both for the rails and spine.