Turning Point 3'' 0.12lb Ball 3D print

[Beepbloop35211]

Ball – A yellow plastic spherical object with a diameter of 3.0” (76mm) and a weight of 0.12lb (55g).
Balls can be used to Score Flags.

The model is a hollowed sphere. Make sure that you print it using PLA (Polylactic acid) and it is a Solid Print.
Turning_Point_Ball(mm).zip (45.7 KB)

[Vyx]

@Beepbloop35211

The model is a hollowed sphere. Make sure that you print it using PAL (Polylactic acid) and it is a Solid Shape.

so this ball is the same size with near accurate weight?

[Beepbloop35211]

@Vyx so this ball is the same size with near accurate weight?

Yes

[gilmorkn472]

No PLA?

[Royal_Freedom]

@gilmorkn472
They’re the same thing. I think the OP had a typo.

[Beepbloop35211]

@Royal_xD They’re the same thing. I think the OP had a typo.

yes xD. My bad xD
Can’t edit now for some reason xD

[DRow]

@Beepbloop35211

Can’t edit now for some reason xD

For the record, posts cannot be edited after 24 hours. I’ve got you covered though.

[Royal_Freedom]

@Beepbloop35211

yes xD. My bad xD
Can’t edit now for some reason xD

xD

[Beepbloop35211]

The print came out fairly accureatly

It is supposed to be 3in in diameter and 0.12lb according to the game manual

[TheColdedge]

so I looked up the the specs on the ball. its suppose to be 55g +/-10. That’s a 18% tolerance and could amount to as much as a 36% swing from ball to ball.

How is that an acceptable tolerance for a plastic part?

For reference the 335g cap has the same tolerance.

[Beepbloop35211]

@TheColdedge How is that an acceptable tolerance for a plastic part?

Considering the fact that the density different from manufacturer to manufacture and the fact that that we have 3 failed print before this. I would consider this as the best we could do for now. We are using the ball mostly for size fiting, not for projectile testing. If that is the case, we also have to account for the surface friction of the ball.

[Connor]

@Beepbloop35211

Considering the fact that the density different from manufacturer to manufacture and the fact that that we have 3 failed print before this. I would consider this as the best we could do for now. We are using the ball mostly for size fiting, not for projectile testing. If that is the case, we also have to account for the surface friction of the ball.

If you’re planning on using the 3D printed balls for just size fitting, why not simply buy the VEX IQ Bankshot balls while they last . To make sure that I get the Bankshot balls to be the same weight as the ones for Turning Point, I opened them by the crease with a knife, then glued small pieces of plastic which is distributed evenly inside of the ball, then glued the balls back together. It worked better than I expected, and I should be prototyping some time next week (Which I may be posting a video of the bot when finished, but only if I feel like I am fine with it).
But anyways, that’s a really nice attempt at printing a ball with an acceptable density for prototyping.

• [TVA]Connor 1814D

[TheColdedge]

@Beepbloop35211

Considering the fact that the density different from manufacturer to manufacture and the fact that that we have 3 failed print before this. I would consider this as the best we could do for now. We are using the ball mostly for size fiting, not for projectile testing. If that is the case, we also have to account for the surface friction of the ball.

Your 3D printed Part is fine. The fact you got it inside of the 18% is commendable.

I’m talking about Vex’s loose tolerances on the official product. Even if the part is blow molded it aught to be tighter than that.