Note works for either 20V Max adapter or 12V battery adapters.
I frequently have to snowblow at night on our street due to our town's inability to understand where the curb is (leaving our street often 3'/1m narrower right at a bend) and since plows drive like it is GTA IV at night, I have ATV Driving lights on my blower. The blower had an anemic 6V flashlight bulb which glowed without doing a lot, I knew I needed more power. For several years I had a 12V Lead Acid motorcycle battery to provide high current 12V but that's a terrible battery type, they die easily, weigh a lot, costly, and since I have a ton of Dewalt batteries, that was perfect. I was going to use one of the 3D printed adapters for the desalts, but under the vibration of the snowblower the contacts were poor. I got an inexpensive injection molded one on Amazon. (note all of the ones on amazon, for 12V and 20V use the same hole pattern I found). which works fine.
I designed this model to need no supports and to firmly attach onto the bar in the middle of the handles. It is a 1" bar (25.4mm) on my Toro, and I'd bet most snowblowers use a similar stock. I use nyloc nuts to hold everything since there is way too much vibration. I printed mine in PETG (canary yellow to match the Dewalt theme).
The adapter uses M4 (note there is extra space to accommodate longer bolts as needed given each adapter is slightly deeper than others). All the other screws are M3 (for the clamp itself).
Bill of Materials you need (see assembly diagram):
M3x8mm cap head screw x2
M3x20mm cap head screw x4
M4x12mm cap head screw x2
Optional M3 washers for #2 (the long screws)
Printing:
I printed in 0.15mm Structural in PETG. The 2 clamps lay on their sides for maximum layer strength and the bottom block as shown in the diagram above. I printed mine on a MK4S
The author marked this model as their own original creation.