Allen key screwdriver style handles

Background. 

I live in South Africa. Allen keys that have a a screwdriver handle are difficult to come by.  I use M3 cap screws a lot in my 3D printer projects so I made a screwdriver handle for the M3 Allen key.
I use Fusion for my 3D modelling but have not made use of the user defined parameters.  I wanted to post the M3 Allen key handle on Printables but decided to set myself the challenge of modelling it in Fusion using parameters such that I just change the across flats dimension and the entire handle resizes – but not by simple scaling but on sliding scales for the various dimensions. 
I have used it from 2.5 AF (M3) to 12AF (M14) and it works fine in Fusion.  I have printed the 4 smaller handles (M3, M4, M5 & M6).  I do not expect there to be much demand for the larger ones but they are there should anyone want them.

Settings
Handles printed standing vertically (it avoids the layer beach marks that arise when printed lying flat).
Filament: PLA or PETG
Setting:  Makers Muse  https://www.youtube.com/watch?v=mE521Q4H6aY
Infill: 15%
Nozzle: 0.4
Layer Height: 0.2
Perimeters: 3
Fill Pattern: Cubic
Support:  Organic (Tree)  Painted onto underside of Collar flange only
 

Print Times
Printer: Prusa i3 MK3 S+         

M3        Handle:             1h58m each
               Collar:                13m
               Register key:  7m

M4:       Handle              2h4m each
               Collar:                14m
               Register key:   9m

M5        Handle:             2h15m each
               Collar:               17m
               Register key:   10m

M6:       Handle:             2h26m each
               Collar:                21m
               Register key:   11m

M8        Handle:             2h35m  each
               Collar:               26m
               Register key:   13m

M10      Handle:             3h4m  each
               Collar:               37m
               Register key:   15m

M12      Handle:             3h26m  each
               Collar:               51m
               Register key:   18m

M14      Handle:             3h54m  each  
               Collar:               1h5m
               Register key:   21m

Assembly.
Rub the mating surfaces of the handle, register key & collar on 180 grit emery paper on glass (mirror) so the glue can bond better.
Test assemble the handle with key & register key.  Sort out any issues.
Spread the adhesive (superglue or epoxy or your preference) on the mating surfaces of the handle bottom & on the register key.
Lay the hex key in the groove in the handle bottom.
Place the register key in the groove.
Put the top of the handle on & clamp until the glue has set.
Make certain the shaft is not skewed before the glue has set.
Spread glue where the collar goes & slide it on.
I sand the filament lines off using abrasive sponges  https://www.klingspor.co.za/products/abrasive-sheets/sw-510?sortierung=Title&seite=4&konfektion=Schleifbl%C3%A4tter&artikelnummer=ao%20120

Updates
20240706 Made collar longer to better align the Allen key in the handle.