3D Printed Droids
MKIII Drives - Printable Version

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MKIII Drives - LarryJ - 02-15-2019

Been away for a while - haven't even touched the printer since before xmas.

Michael released his new drives and it started the itch back up again.

Here's the main frame in PLA - probably going to re-do it in PETG. It's pretty strong, but after I finished it I realized I did the last ones in PETG and they have held up great, why mess with a good thing. By offsetting the holes in the cross brackets, Michael made it real easy figuring out which parts go where.

[attachment=1449]

Here are all the drive train pieces, these are all printed in PETG [6 shells (top/bottom/sides) - 30% fill]. The pieces on the left are printed axles - I'll most likely replace these with metal equivalents.

[attachment=1455]

When installing the gears, install the middle one from inside the motor cage - and then move it left/right into position - fought with this one for a bit.

[attachment=1450] [attachment=1451]

The rest is pretty straight forward.

[attachment=1452] [attachment=1453] [attachment=1454]

I printed the tire with Ninjaflex Cheetah [ 3 shells - 20% infill ] - the lower infill gives the tire a little bit of flex. I lubed the edge of wheel with some Super Lube and positioned the tire on as far as I could by hand - a couple whacks with a rubber mallet and it popped right on - MUCH easier than V2.

[attachment=1456]

Still waiting for some hardware and I still need to print the upper part of the assembly (ankle) before putting it together to test it out.


RE: MKIII Drives - R3D3 - 02-15-2019

Looks nice, Is the tire the same as V2?


RE: MKIII Drives - LarryJ - 02-15-2019

(02-15-2019, 07:21 PM)R3D3 Wrote: Looks nice,   Is the tire the same as V2?

No, the wheel/tire are about 1cm thinner than V2 and he swapped the pegs/slots that hold the drive gear to the wheel.


RE: MKIII Drives - R3D3 - 02-15-2019

Thanks!


RE: MKIII Drives - tk5331 - 02-18-2019

I assembled the MK-3 foot drives too.
Did you use some flat washer for drive gears?
Mine is little bit tight.


RE: MKIII Drives - Eebel - 02-19-2019

Does this use the same Razer Scooter motors?  Mine ran hot in V2 and I am concerned about durability with PETG.

Eebel


RE: MKIII Drives - gpavey - 02-20-2019

(02-18-2019, 02:24 AM)tk5331 Wrote: I assembled the MK-3 foot drives too.
Did you use some flat washer for drive gears?
Mine is little bit tight.

Just finished one side. I used washers whenever I had enough room.


RE: MKIII Drives - LarryJ - 03-01-2019

(02-19-2019, 05:54 PM)Eebel Wrote: Does this use the same Razer Scooter motors?  Mine ran hot in V2 and I am concerned about durability with PETG.

Eebel

Yes, same motors. I think the tension that was required for the belts didn't help the motors very much - direct drive should be a bit easier on them.


RE: MKIII Drives - Prettyfloralbonnet - 03-05-2019

I have perhaps a dumb question: do these new drives work with the existing v2 shells?


RE: MKIII Drives - LarryJ - 03-06-2019

(03-05-2019, 07:39 PM)Prettyfloralbonnet Wrote: I have perhaps a dumb question: do these new drives work with the existing v2 shells?

Yes. He has also updated the shells, but the MKIII drives will work with the V2 shells.