Most cheap STL packs are modeled for the screenshot, not for a $200 FDM printer.

You buy a vase that looks sharp on the listing. Then you spend 4 hours fighting elephant foot, a 0.8 mm wall that will not extrude, and a base that warps off the bed. That is not a file problem you can "just scale." That is a file that was never sliced on the machine your buyers actually own.

If you sell printed home decor, the file has to survive:

• 0.4 mm nozzle

• PLA on a stock bed

• no custom supports you cannot explain in a 2-line listing

That is the bar I design to. Print one, then list. If it fails on a common setup, the file is not ready.

I put a Home Decor STL pack up for Etsy sellers and small print farms who are tired of remodeling other people's meshes. Files only. If your printer is the problem, that is a separate 1-hour session, not a lifetime promise.