This is a FDM-friendly version of my Hot Rod design (the original was designed for SLS printing).
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I strongly recommend printing in ABS or PETG for strength (ABS does tend to warp on such large thin prints, but if you can get it to work then bonding the roof with acetone will result in a really strong body).
There is a significant chunk of support material needed under the hood in front of the windshield, everywhere else is support-free. I chose to do it this way to keep strength and reduce warping.
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UPDATE: By request I have also uploaded the parts that I designed for laser cutting, they can be printed, but won't be very strong.