Scale Models / Maquetas / H0 &+

hi quick question what is the best to glue pla parts for the strongest result
thanks

I was wondering if anyone knows what percentage bigger O scale is from HO. I see many HO scale models here I would love to print, but I use O scale and I'm not sure how much bigger percentage wise O is from HO. Or even N scale. I'd love to scale some of these models up and add them to my layout. I'm not too picky, really. Not the kind of model railroader that goes for ultra-realism.

I tried to make some figurines and Shopping Carts for HO Railroad. But when I try to slice them half of the models are not shown in the slice. I also tried to print, but it is faulty like the slice preview showed. I use a Anycubic Mega S . Any ideas , how to fix or prevent that?

Wondering if anyone would be interested in modifying my thing, https://www.thingiverse.com/thing:4498138. I'm not a great 3D modeler but would love to have a decent model of the Spaceship of Ezekiel. I've come close but I can't get the concave cone or some of the finer details. Anyone interested in remixing it into something worth printing? If you Google "Spaceship of Ezekiel" you can find tons of reference pictures.

Hi, I would to know if one of have the file Citroën SM Slot Car because this file has been deleted.
Thanks in advance