911ren20

I've been using the rennline holder for my lithium battery. The battery is only 4lbs. The bracket is surprisingly heavy, it is actually overkill. However, there isn't other options in the market that can rival rennlines quality and at a reasonable price. So I decided to make my own to have it 3d printed. It's a fun project, but It really isn't that cost effective with the learning curve and time invested in modeling. I've printed the parts, just need to source the m6 screws to assemble.

The wall is 5mm thick. Very little flex. I am no engineer, Any engineer rennlister here wants to leave feedback?

Marine Blue

What is the material of construction for the 3D printed model? Some things to consider are the forces that will be imparted where the sides bolt to the base. These areas may need to be beefed up a bit to handle the forces. Same for the small tabs on the base that keep the battery in place, they may also need to be beefed up depending on material. Other than that it’s a brilliant idea and it would be nice to have some flexibility with battery hold down options.

911ren20

Right now, I am printing the prototype in regular PLA. The weakest areas are on the angles. I will put some miles on and see. The hypothesis is that since there aren't any tensile stress on the holder with the way the battery is mounted. there shouldn't be much load on the holder at all. I think time will tell.
Speaking from a hobbyist perspective

And thanks for the suggestion on the areas that may need beefing up. The reason for the current size is that I am trying to keep the printing time to a minimum for proof of concept. each piece does require over an hr of printing time with 20% infill.

I also had to print the base to two pieces. The printer bed wasn't big enough Also open to suggestions on mounting point. it's utilizing the stock mounting hole now.

cjoenck

The only other thing to consider may be what happens at impact. You have a 4 lbs object decelerating from 70 mph to zero in a fraction of a second. That will create considerable force on the mount. Last thing you need is a lithium battery floating in your trunk during an accident. Just a thought.

Foxman

Very cool design, and agree the Rennline battery mount is too heavy. But you definitely need a secure metal strap around the unit. A thin piece of strapping will do. This may be in my future as well. Could lose another three pounds or so.

964George

I thought this was a good lightweight option, screwed or riveted to the frunk, in the same orientation as the existing battery mount.
BTW, the Battery Tender 480 is the same dimensions as the Odyssey 545.

https://www.ebay.co.uk/itm/OBP-Light...9/141946079371

Pol911

Mounting of the LiteBlox battery in my 964

dukmon

Tidy!

Mikke_Possu

Stunning. And so clean.....

911ren20

ha. I may just take out those plastic panels as well.

I am selling the rennline holder. as I already installed the 3d print prototype. So far so goodl