- Missing dimensions- If you don’t know, we can’t guess.
- Conflicting dimensions or tolerances- Please choose wisely.
- Confusing geometry- We see the lines but have no idea what the part is supposed to look like. Please add appropriate hidden lines, views and other clues as to what you want.
- Fuzzy figures- Please provide electronic copies with sufficient resolution that all numbers and details are clear.
- Tolerances too tight for proposed fabrication methods- If you don’t want to pay for grinding, lapping and honing, move the decimal over by one or more places. That would be to the right, in case you were wondering.
And thanks to Feral for posting it(a bit NSFW at times)