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I made an universal T bar handle as a one fits all solution. Since I didn't want to print a handle for every hex key, I made one that fits all the six sizes. You can easily switch between the keys.
The smallest hex key isn't perfectly centered but can still be used properly.
I was inspired by Kezat but designed the whole handle from scratch.
Print Settings
Printer brand: Creality
Printer: Ender 3 Pro
Rafts: Doesn't Matter
Supports: No
Infill: > 50%
Filament brand: n/a
Filament color: n/a
Filament material: PETG, PLA
Notes:
I would recommend increasing the wall thickness to 4.
For the nut, decreasing the XY Size Compensation by about 0.2mm for better fit.