Unlimited Refill Mod for Dettol/Sagrotan No Touch (Improved Version)

This way you customize the last Dettol/Sagrotan refill unit you'd be buying, into a truly unlimited refill. Also, you reduce plastic waste in long term. You can then freely refill it with any of the liquid soaps that you would buy in bulk quantities.

I improved my previous design, making a cap with beads, so that it stays in place. It's not a screw cap.

I have designed three variants of the cap.

• The normal variant is loose, but if you accidentally drop the No Touch the cap may easily come off.
• The tight variant has its beads slightly wider. This fill feel a little difficult to open and close in the beginning.
• Tight variant with air vents is the same as above, but I created two air vents with 1.5 mm diameter each, so it might feel a little easier to open and close.

I have included pictures but you can't really see much of the difference using a vernier caliper with 0.02 mm resolution.

Things you need:

• Your 3D printer and filament 
• A precision knife and safety gloves
• Epoxy glue and a toothpick

Recommendations for printing:

• 0.2 mm layer thickness with 0.4 mm nozzle is enough. (standard quality)
• Base: infill density ~ 10% - 20%, with normal supports and brim type adhesion
• Cap: infill density = 5%, no supports and brim type adhesion

Instructions for use:

1. Clean the refill unit and make sure the surface is dry.
2. Cut an ellipse off the top of the refill unit without damaging the edge. It must be about 30 mm wide from the center.
3. Maybe it's a good idea to draw small ‘x’-es with your precision knife to make the glossy surface of the refill unit, so that it's roughened for epoxy glue.
4. Glue the printed base onto the refill unit.
5. Enjoy the liberty!

Much thanks to the original creator @Hubi for creating a perfectly fitting cover.

I created a simple opening and a cap similar to a bottle cap, so that the unit can be refilled with any liquid soap that you buy in large quantities. In comparison to the previous similar model I made, this bottle cap is better with beads.