I'm sorry to have to give you bad news about the awards. I had some 3D models printed in 1:24 scale with very bad results. I then changed supplier and switched to 1:18 scale, but the result is still bad (despite having substantially remodeled the cars, considering that the geometry was not that clean). The only way to achieve acceptable reproductions would be to switch to a scale of 1: 8 or to start from a very clean STEP model, but the costs are far too high (also considering the failed tests), at least for this year. Maybe in 2021 I will think about a solution.
I therefore decided to replace 3D printing with the alternative "coin" prize. One of the two winners (2018 and 2020) has already been contacted and will receive the prize today (2x100€), the other (2019, best rookie) will be contacted shortly (I have an old email address, if you did not receive my email today, please send me a MP from this forum).
I apologize for the wait, unfortunately 3 online printing services, after accepting the order, gave up after many weeks or provided "indecent" 3D prints.
EDIT: Here is the report with the critical thickness.
https://www.caedevice.net/SERVER/MVRC/2 ... ckness.jpg
In the future only parametric models (Solidworks, FreeCAD, Creo) or clean STEP with minimum thickness 1mm will be considered for printing, I am very sorry but models created with SketchUp are almost impossible to adapt if they are not already compliant (money prize option is confirmed anyway), especially if they inlcude "bad" geometry areas.