Junco 75

By The Van on Jan 09, 2019

75  1,859  20

Project Junco

It’s an open source printable brushless whoop frame – currently available in 65mm & 75mm, designed around standard whoop-sized brushless components.

Goods & Info here - Project Junco

Little bit of extra background - I wasn't initially planning on making any micro frames this year. I knew that after starting to ship the Raven in October, there wouldn't be enough time to design, prototype, & produce a finished frame by winter.. so I decided it'd be fun to design something to be printed & make it open source. Even so, getting it to this point took about a month longer than I'd planned for. Now that most of the legwork is done, I'm excited catch up on some other designs!

This is currently my 75mm Junco build. The powertrain isn't exactly up-to-date with today's trends - but I do really enjoy the convenience of 1S. I will eventually be changing the motors out for probably an 0803, and then the Beta F4 2S AIO.

Even with these little motors though, it's a fun indoor flier and much more efficient than the same setup in a 65mm frame :)

Looking at the bottom you can see how I've hooked up the rubber bands - this is nice as (on each end) one band goes around the battery and one band stays down as padding. Keeps it from introducing vibes vs just wrapping it across the middle.

TBS and Rakonheli both make props (31mm & 40mm) with through-holes that can be mounted upside-down.



Sign in to comment

EpikOlogie   Apr 03, 2020  

what battery?

Samw85   Aug 25, 2019  

I ordered some new material (high impact engineering resin for the formlabs form2) and will print this frame and see how it performs :)

Maybe i can give you feedback, also potentially for a 85mm and 65mm version


MicroManiac   Jan 18, 2019  

Amazing project! Would love to try out the 65mm version.

Taylormadearmy   Jan 10, 2019  

Lovely build!
What did you print it in?

Show 1 more comment
bistro   Jan 17, 2019 

PolyMax PLA is wonderfull, althoug try Fillamentum CF15 if youll have a chance. That stuff is perfect for impacts. Shame it doesnt print as comfortable as PolyMax

The Van   Jan 17, 2019 

Nice I'll give that a shot :) I used Fillamentum's 98A TPU on some earlier prototypes.. very interesting stuff that could work really well for this, but also doesn't print super easy so I might have to revisit that a bit as well.

Taylormadearmy   Jan 17, 2019 

I will give it a go in polycarbonate when i have some time... hould be super strong...

StickyRice   Jan 14, 2019  

what it the battery was top mounted oOooOooO. Cool buid dude!!

StickyRice   Jan 14, 2019 

like the camera is infront and theres a battery slot you can put that attaches to 2 of the fc mounting holes
that would be lit!!

The Van   Jan 14, 2019 

There's an idea! I'm sure it wouldn't take much, maybe we'll see a variant like that in the future :)

StickyRice   Jan 14, 2019 

i just like top mount because i crash hard and the battery is ussually the one that gets dented huhu

cptandy   Jan 10, 2019  

Will you sell prints of the frame directly off your site I would like one please to build with. What a beautiful frame! WELL DONE

The Van   Jan 11, 2019 

Eventually, yes. But as it's still pretty early in development I'm going to wait until it's further along before I start selling it. Even though it's pretty clear that it's a project, there's a quality standard to reasonably expect when you pay for something & the Junco just isn't there yet! Also, my printers stay pretty busy between Raven production & new developments.

So, what I've done for now is made a printing service channel in our Discord server. We've got about 40 members and counting, so feel free to drop in and request a print. Otherwise you could take the model and upload to a printing service like shapeways & they'll be on Thingiverse soon as well, which has its own options for printing services :)

QU|(K_F0X   Jan 10, 2019  

I edited the design to work with 16x16mm stacks and the old racerstar 1103 motors, is there any place to upload the version on your website?

Show 1 more comment
ghostface   Jan 10, 2019 

Why not also upload it on thingiverse and add a remix?

The Van   Jan 10, 2019 

Eventually I'll post the main files up there, but for now I've decided to host them myself. Others are free to upload iterations wherever though

ghostface   Jan 10, 2019 

fair enough :)

d'jazz.fpv   Jan 10, 2019  

Love your project :)

Guides & Reviews

28 2,434  33
28 days ago

This guide will walk you through the process of building your first FPV quad. The goal with this design was to build a low-cost, lightweight quad, yet powerful enough to safely carry a GoPro in close proximity areas. I chose these parts to minimize the amount of soldering at no cost to the quality. A typical build requires around 30 solders while this only needs 25. It's not a huge difference, but..

Read more
26 6,951  24
Nov 30, 2019

In late 2019 DJI made inroads into the FPV scene with their remarkable low-latency digital system. It gave us a 720p video feed with latency on-par with the status quo, analog video. Traditionally we've used analog video systems for low-latency video, but the video quality is far from ideal. It's a trade-off we've been willing to accept for the control. Now we've got the best of both worlds and what..

Read more