Wingnuts designed for an m3 standard nut. Tolerances are tight (good for nuts), if you have a high resolution printer leave it as is. For flashforge,creator,ctc scale to 100.5% or 101.00% when printing .10mm.
Prints really well at .10mm and 100% infill. Print on its flat side. If tolerances are too tight scale to 100.5-101%. When placing the nut, threat it to a m3 bolt and push the bolt and nut in, its much easier.