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Ryobi Mains Power to 18v Power Pack

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3D model description


I made this Power Pack for high drain applications, such as running my shop vac or heat gun where I didn't want to burn through a battery. It's also useful for stationary tools like a chop saw and frees up a battery you can use elsewhere.

Included in the files are feet to raise it higher up off the ground to allow more cable storage. You are limited in length of cable due to voltage drop over longer lengths. I used about 3 metres on the mains side and about five on the 18v side. There is a voltage drop at these lengths, however the tools I have tried it will all work fine.


3 x Cable ties
1 x power adapter (I used an 18v 20Amp available here )
1 length two core wire (I used 3mm for each core which is quite thick)
1 length triple core wire (I used immersion heater wire but this is overkill)
1 plug
1 dead battery that can be cannibalised (I bought one for a couple of quid from ebay)
Some epoxy
Optional; 3d printer pen
Small length of rope for handle


Print top and bottom. Feed in 18v wire on one side, 220v on the other and wire to power transformer. Apply cable ties inside to cables to make chokes / stop them getting pulled out and attach cabling to transformer. Secure transformer in place with 3d printer pen (or other suitable means). Glue top and bottom halves together. Optionally add 2 x feet to the base to increase amount of cable which can be stored. Disassemble donor battery, remove cells and solder on 18v contacts (battery polarity is shown but use multimeter to confirm). Wire up mains plug.

The design has been updated slightly to incorporate improvements from the original pictured prototype including replacing the plastic handle with a rope one. Feed the rope through the holes, tie a knot and repeat on the other side.

3D printing settings


3D printer file information

  • 3D design format: STL Folder details Close
    • Bottom.stl
    • Top.stl
    • foot.stl

    Learn more about the formats

  • Publication date: 2021-03-05 at 02:34
    Published to Thingiverse on: 2021-02-15 at 00:05





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