Look into 3m VHB gel tape. It holds 10 lbs for every .75" piece or something like that.
I've used it deploying things in high-theft environments and it's held up well. An iPad, stuck to a desk with two 4" strips of vhb took two grown men almost 45 minutes to remove
it took part of the table surface with it.
https://www.3m.com/3M/en_US/company...1094&preselect=8710676+8710815+8710960&rt=rud
I've used it for years to stick shit to my motorcycle helmets, like viking horns and googly eyes and stuff. VHB is the adhesive that comes on stock gopro mounts, if anyones ever dealt with trying to remove one from a prepped surface
Is the tape failing to stick to the 3d print, or the car?