Rapid Relay - 1x parts for the win holiday contest

In the early years of VIQ there were some pretty amazing robots that were heavy on struts. They were light, very airy and pretty interesting.

Across the last few years, 2x and big plates have become more popular. For the last two years and this year, it’s been chunky robots.

I think the 1x parts have a place. If you connect them at 90 degrees along the length they are as strong if not stronger than a 2x beam. With the wide variety of corner connectors and the new beam parts, there isn’t a limit on what you can build.

We are also coming up on Thanksgiving and Christmas Holidays. So there is some build slack time on the horizon. And while the Kiwi teams are at a disadvantage because NZ is awesome in the Summer (I lived there for awhile) I’m going to push this across the next two months,

Contest: Best Rapid Relay Robot that is 80% 1x parts. I’m hoping for robots that can scoop up passed balls and shoot.

Criteria: 80% or more of the frame building components are 1x parts. So motors, gears and wheels don’t count. I want to see the 1x parts highlighted.

Looking for the most complete competitor, so functions matter.

Submissions: by 11:59 PM on January 1, 2025. I want 6 pictures, bottom, top, all 4 sides. I’d like to see them posted to this thread. But I understand that you may have found out that 1x parts are cool and are actually building your competition robot this way. In that case, email me at Foster dot Schucker at STEMRobotics dot org.

Prizes: First $100 in VEX parts before shipping, Second $75 before shipping and third $50 before shipping. In the event of a lack of entries, prizes will be rolled up. So if you are the only entry, it’s a $225 prize. Only first and second will split the $50 third place money.

There have been an epic number of parts in the last few field elements that are 1x. Kits are littered with 1x parts. Here is a chance to really show off your design and engineering skills, prove to us you are better than “Moar Plastic”

Feel free to ask questions.

As always, judges decisions are final even if they are petty, vindictive, capricious and arbitrary. Bribes are not condoned, but I am up for listening to your “offer”. This contest may be illegal in your town, state or providence, it’s up to you to figure this out. Contestants must be under 18 at the time of submission. If you are older, email your submission, I may or may not have additional prize money.

To be transparent, I’ve been very impressed with what people have been building in the last 4 years. I can’t speak for the VEXIQ management and Engineers, but I have been blown away by some of the recent constructions. I’m excited to see what you all can come up with given this extra but minor constraint.

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Count me in! (maybe)

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Just a reminder, Christmas break has started, so this is high on your list. I did get asked if I would take CAD solutions. Yes, CAD away, while I love “As built”, I’ll take submissions from roboteers showing off CAD skills.

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I apologize if you said this somewhere, but do connector pins and shafts count?

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Misc bits like corner connectors, shafts, standoffs, etc. do not count. Pretty much anything that isn’t a 2x or larger (ie 3x, 4x, etc.) is fair game.

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Build time: ~2hrs

His name is stringbean, and he can score lowgoal.

We were a bit limited on parts (hence the crazy shaft lengths and brain placement)

this was super fun!

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Wow, very impressed, the robot is almost ethereal with the few number of 1x components. I really like all of the standoffs being used all over the place as supports and in the intakes.

Looks like there is only 4 pieces of 2x, if you had some more 1x20 and 1x10 could those 2x be swapped out? I’m impressed with the 2 hour build time, most days it takes me that long to find the right pieces.

Stringbean looks like it’s pretty sturdy, I see you have ~500 of the 0x2 pins holding things together. Even with all the random axle lengths it’s a very clean build.

Is there custom code or just the stock driver control?

For your first post, and a first entry into the contest you’ve done a great job! You’ve set the bar very, very high. I’m interested in seeing what comes in between now and the end if the first full day in January.

Thanks very much for your entry!

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This is my robot for the entry:
His name is Vexy!






  • It was made on LDCadVEX.
  • It is a backroller robot, which is the current meta, and type of robot used to set the world record robot for teamwork and skills.
  • It is made and designed entirely by me, a 13 year old.
  • It has a 2 motor 2:1 drivetrain, a 2 motor 5:1 intake, a 1 motor 1:1 gravity gear winch/catapult and a 1 motor 3:1 backroller.
  • The way backrollers work is they have a catapult for scoring high goal and a spinner at the back for scoring low goal quickly.
  • I have coloured the 1x beams in aqua.
  • There are no cables as I couldn’t work them out in CAD.
  • There is also no chain or rubber bands on the intake and spinners because i couldnt work them out in cad, the spinners are supposed to have rubber bands on them and the is supposed to be chain from the motor powered 40 tooth sprockets to the small 8 tooth sprockets on the same axle as the three intake spinners.
  • It took about 15 hours in total to CAD.
  • This was a very fun competition to build a robot for! Thank you so much for organizing it!
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Yeah, sadly we completely ran out of 1x parts :frowning_with_open_mouth:

bean man is running a custom code



We wanted to be able to run all intakes individually, so that we could outake one ball for a pass, and pick it back up instead of wasting time moving the first ball back up the ramp. Additionally, we wanted to set the velocity + stopping.

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I love the absence of 2x beams, but that robot will probably tip over. Other than that, great!

Yep, I get it, even with my parts collection I ended up getting some packs of the long 1x beams.

Nice job on the code, I like your decisions on what functions you needed to split out to make all of this work smoothly. I like the thoughts into the strategy to be able to out-take to get the pass to work.

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Thanks for our first CAD only entry! Nice job. I appreciate the description block of what you’ve built. I’m impressed that you spent as long as you did on the CAD. I really like how you really supported the base.

I want to as about the 2x parts that you used. Like @3apples could you have done doubled up 1x parts, maybe pinning across the beams with 1x2 connectors?

From the CAD file you sent me, it looks like you are using LDraw, maybe someone can chip in on how to do the rubber bands. Can you tell me what parts library you are using for LDraw?

Overall great job on the design!!

I don’t think it will, the brain / battery is pretty low to the ground. There isn’t very much weight in the superstructure. The base is both wide and long, (18x20) so it has a substantial base. But maybe you’ve seen something I missed. Do you think that the three floating motors will move the CoG that much?

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I don’t know exactly, but I think with the chain and rubberbands on (mayye not rubberbands, thoes are light enough) the robot will be unstable especially with stopping and reversing. I think just putting a small anti-tip piece, and it will be fine.

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On our robot we used this season at nationals had the same size drivebase and was longer than this robot, and still didn’t tip over!

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Also just letting you guys know:
In the pictures the robot looks a bit wonky, that is not the case, i just couldn’t turn the robot to the perfectly correct angle for the photos.

i
I have also made this drivecode for this robot.

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@holbrook - Can you offer @RoboticsIsFun tips on how to add the rubber bands and sprockets to their CAD?

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Here’s the relevant section of the documentation, scroll down to “rubber bands” about halfway down the page.

https://www.melkert.net/LDCad/docs/advEdit

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Submission #2 for Vexy, all information is the same as the last submission, so read that first please. I have now added chain, pins holding the motors on, and beams at the front to ensure it does not tip. (+2 hours of cadding time)

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Thanks @holbrook for the tips.

@RoboticsIsFun - Nice job on the update to it, thanks!

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