The Step Bro - A Largely 3d Printed Build - COMPLETE!

Woke up early so I sorted the little guy, will solder them both up tonight and get them wrapped!

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:yum::yum::yum:

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Finished up the packs :partying_face:

Now i just gotta make a Y split from the bms balance harness and a charge harness and the battery is complete!

Put the jst headers on the motor sensor wires too. I tried to undo the bolts of the jump drives to step them down a notch, but the loctite has gone off HARD. Gonna get a little butane torch onto them tomorrow because they need to come down a bit.

Spent $200 at the bolt shop yesterday, so hopefully I have all the bolts i need :expressionless:

Getting very close to getting it all together!!!

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Got up early this morning and fitted the under slung battery. Its all super snug with EVA foam top and bottom and some good packaging foam to stop the pack moving side to side.

Squeezed in a 10km walk with this moron


Adjusted the jump drives down a notch… it was a bad decision to use red loctite on the adjustment bolts, but I prevailed.

I really appreciate the fine levels of adjustment that you have with these drives, it’s really nice to be able to just move things a whisker rather than a mile. Great job there @ApexBoards


Double/triple checking lengths



Motor wires are sorted!

The last leg is a harness for the escs to the batteries and to hook up the bms! There is light at the end of the tunnel!!!

Still a couple of fluff bits to design/print, like a handle and a piece to hold down my phase connections, but nearly operational :partying_face:

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You are not worried about the phase wires going straight through the metal plate without any edge protection?

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Haha yeah i am actually. As i passed them through the plate I figured they should have some protection. I’ll go to the auto store tomorrow and see if i can get some grommets

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Actually. Fuck the auto store, i’ll print something for it!

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Perhaps just cleaning up the hole at an angle with a drill bit would alleviate the right angle strain?

Regardless, your attention to detail has secured BOTY for me.

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Agreed… BOTY vote for me too. I love seeing this thing come together. Seeing your designed and printed parts all actually fit together as intended and then have wires run through them and such gives me a neural boner

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I did consider that, if I have the room to do it, i’ll incorporate a slight angle into the 3d print.

My intention has been to 3dp a ‘tray’ into the top box to hold the bms in place as well as to act as a spacer to restrict movement of the battery.

I’ll add the cable pass through into this print as well as zip tie loops for all the wiring.

Hopefully get some time to model it up today!

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Me every single time i go to jaycar

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The angle will help, but I’m sure vibration will do a number on the insulation anyway. Maybe you could put a layer or two of heatshrink around them as they pass through the plate, or maybe a plastic straw?

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Its all already sorted mate, will get pics in a bit. In the meantime, I did some weird shit this morning…



Parallel connector/splitter for my batteries to escs

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So i made some little TPU thingies to get sandwiched between petg on both sides…


It all seemed to be going pretty well… and then I put the battery in…

I can’t close it up :dizzy_face: its all just too tight in there. The whole top box is gonna need a redesign.

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Bed time.

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Redesigned the top box. Will need to cut new plates for it, but that’s no dramas.

This revised version will let me mount the solos in the bottom of the box, pushed all the way to the back wall. I’ll need to remove the heatsink and mount the escs directly to the bottom aluminium plate.

Moved the switch into the walls, so now the top plate will be completely clean.

Still need to design some more parts for wire routing and to secure the escs/bms.

Hopefully this revision works! :crossed_fingers::crossed_fingers::crossed_fingers:

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Printed and glued… plates next

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This has also fixed the magnetic files between poles.

Electrical phases should not go thro separate holes in metal because of the electric filed it genarated heating up the plate and pulling the wave form out and vibrating cables.

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giphy

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I doubt that plate is inductivly heating up in a measurable was by 6 phase wires going thought perpendicular

Good to know! The new design means that i don’t need to pass any wires through the plate, so no worry at all there.

While I appreciate that this may be true, it’s still good to know these things from a design and best practice point of view!

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