Generic Barrel Nut to suit UK 3-pin plug

Andrew Roth's Dual Spool Cord Wrap is a useful model to make use of empty filament spools. I printed the 'generic' version for an extension lead, and I realised that the barrel nut is just about big enough to hold a UK 3-pin plug. So this model includes holes for the legs of the plug, and will serve as a plug keeper. You can use a plug to get a (better) grip on the nut while tightening the barrel screw. Angle it so that the cable points in a suitable direction. Start with the plug end when winding the cable onto the spools.