My 6yr old and I have been building all kinds of cardboard tracks for a while. We really wanted to buy the Mag Track but appreciate the production scaling issues. We recently decided to host a die cast car race to raise a little money for our local Children's Hospice so when we saw you'd very generously released the files we thought we'd get building. So far so good. I use a CR10s (Stock, apart from bed adjustment grip wheels) to print. The curve files come in at about 6-7hrs
Will update on progress.
If you are in the Nottinghamshire, Leicestershire, Derbyshire area of the UK and want to see the track we're holding the race day on the 28th September at the Soar Valley Garden Railway