this is a remix of:
Velleman K8400 Extruder repositioning
by Hardbats Dec 24, 2017, who has the credit for the idea:thanks Hardbats!
I simply edited the original meshes in Blender to remove the Hexagon holes, as I believe it would be more sturdy and resistant to compression during screwing the nuts.
Being done in blender, check your scale and scale it 10 fold if required