Peyote's 3D Printed Dash Updates

I've had quite a few experiences with 3d printing.

Your design is excellent, but I think ABS in an FDM process is going to disappoint. The build layers being perpendicular to your circular openings almost certainly means they won't be round.

ABS worries me also. Being exposed to UV and the heat inside a car will likely mean a short lifespan before it warps or fails. Unless you have a friend willing to do it on the cheap, I'd avoid FDM for this part.

Personally, for the effort, I'd look into a glass filled Nylon 12 done in an SLS process. It won't require support structure during the print - which means less cost for trimming post-print and less machine time making the supports. The print also won't be as 'tall' which means less cost in the process. The surface finish of SLS is better than FDM, and the Nylon 12 glass-filled is super strong and far more UV resistant. The build layers would also most likely wind up normal to the bore axis of the gauge openings which means round holes - I'd ensure the place doing the work does it in that orientation. The surface of SLS nylon is a little porous which means it will take paint/primer/filler VERY well and can wind up very smooth. It starts smoother than FDM (unless you do a vapor smoothing on the FDM, but UV will ruin it anyway). The strength in all 3 axes is also far closer to equal since a laser sinters each layer together.

Not a knock, just my .02 after probably $100k in prototypes over 8 years in all kinds of materials and processes (FDM, SLS nylon, DMLS 17-4 stainless, SLS carbon fiber reinforced nylon, SLA, urethane castings, and PolyJet).