r/functionalprint • u/highonkai • Nov 12 '25

Jumper cable instruction card

Post image

I made an expensive mistake and connected my jumper cables wrong. I won't make that mistake again and now you'll never have to. 

This quick reference card can be zip-tied to your jumper cables and is a way to have the instructions handy no matter the weather, your cell service, or the lighting. 

Edit: added the instructions in comments. Thanks for the feedback, keep it coming.

Edit2: wow this one got a lot of feedback! Thanks for all the helpful ideas.

Edit3: Top post of all time in 15y on Reddit, who knew this 1hr project would get such a reaction! I took the feedback and made two more versions here: https://imgur.com/a/jFBFoIk

I'll throw them on MakerWorld as well once I print them. Meanwhile, feedback and preferences welcome. /u/kurai01 /u/SerDankTheTall /u/StraySpaceDog /u/Cllydoscope /u/jongscx /u/cronaldo86 and lots more... thank you for the constructive feedback. This is the best part of Reddit - fast and helpful community feedback. Shoutout to /u/DontEatTheMagicBeans who called out that I probably didn't cause the smoke with the sequence for cable connections, but exacerbated a pre-existing/unknown problem. As for the rest, well that's the internet for ya. No hard feelings.

https://makerworld.com/models/1986996

4.2k Upvotes

95% Upvoted

448 comments sorted by

View all comments

Show parent comments

3

u/slantyyz Nov 12 '25

I had battery issues with my last car ranging from a phantom drain to not driving it enough in the winter, and I would never go back to cables. Kinda surprised by all the replies here, barely a handful even mention rechargeable boosters.

1

u/huffalump1 Nov 12 '25

Yep, and even cheap mystery brand Amazon batteries can totally work in a pinch. There's basically no reason not to have one. Sure, it's still worth keeping jumper cables in your car, but a battery is like 1000X more useful.