Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2157062.

Thumb nuts for bed leveling screws. Made as large as possible to accommodate large hands in tight spaces.

Use M3 hex nut... hex fits snug in PLA

Designed around TronXY P802E... Will probably fit other similar printers

UPDATE: 3/9/2017 - I suggest to anyone going to print these... use ABS or other that can withstand higher temps. I had originally printed these in PLA, after several uses I have noticed that the heat transferred from the the hot bed, through the screw and into the nut has actually melted the PLA slightly. If you only print PLA or other plastics that only require very low temps it may not be an issue. I suspect the melting happened during my attempts to print ABS when the bed temps need to be 100+.