Some of the scenarios in Gaslands require the vehicles to pass through gates in a particular order as well as a start/finish line.
After tinkering about with some designs of my own and not being particularly happy with any of them, I stumbled upon a design on Thingiverse for a Small checkpoint gate for small R/C or slotcars by MoMaHo.
Although they are a simple design, what attracted me to them was (a) they aren’t too stylised which means I can tweak them to my heart's content, and (b) they are designed to easily expand/contract according to how wide you need the gates to be. Sweet!
I opted to print out four gates worth of parts on the Cetus-3D (0.2mm layer height at 20% infill for strength and weight) which should be enough for a 4’x4’ race area.
The clearance on these is between 14cm to 22cm (inner tyre edges) with a top clearance of 9cm. Pretty much the only thing that won’t fit under it is a big war rig, but to be honest you wouldn’t be racing war rigs… would you? Hmm.
Next up, I wanted a way to indicate (a) what the gate number was (or if it was the Start/Finish line) etc., and (b) which was the correct way through the gate. I modified some Ork Armour Plates from Tinkercad (by simonjhenry), scaled them up and glued them in place. The idea will be to rust/weather them and then scrawl over them in a graffiti-like manner with the relevant information.
You can find my other gaming projects in my Google collection: https://plus.google.com/u/0/b/112410031132261161274/collection/IDCtPE
My Cetus has a LokBuild print surface on it so I don't use rafts, depending upon your setup you might.