I have had those exact ones for 3.5 years and they are good enough for 3D printing purposes. Mine are all within a few percent/degrees iirc. Yes, they take some time to equilibrate (2 hours seems a little long, though), but remember, ziplock bags are not going to keep moisture out.
Get some...
You can incorporate three vertical ribs into the main part around each cup holder hole that bow inward for a friction fit. Another option is to incorporate three vertical slots into the main part around each cup holder about 3/8" away from the cup holder. Slide some curved TPU pieces into the...
I do think 30% less than $10, when there is no cheaper filament that can be purchased, qualifies as dirt cheap. Again, PLA has its place and is the right filament for certain jobs. I have 5.5 year-old PLA prints that are still perfect and in daily use. The post above that may have been deleted...
Lol. PLA rules because it's dirt cheap and great for prototypes, templates, jigs, measuring tools, it's stiffness, dimensional accuracy etc. I can go on. Not to mention it's more environmentally friendly.