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June 10, 2020 at 7:54 pm #8564@
## Request for Pen Ball
I printed one of these pen balls for a friend of mine. The ball may be a little big for her hands. I was wondering if you have a parametric model where I can change the diameter of the ball but keep the other holes/slots for screws and nuts, and their placements the same?
### Project PageJune 10, 2020 at 7:54 pm #8565
@SRv can you help with this?June 10, 2020 at 7:54 pm #8566
Hi Alice – great to hear from you Thanks for making the device for your friend!
The [Pen Ball](https://makersmakingchange.com/project/pen-ball/) does allow a small amount of customization, but it doesn’t work directly with Customizer. You can try changing the parameters in the OpenSCAD script, or if you let me know how much smaller might work, I will see if I can make that work.June 10, 2020 at 7:54 pm #8567
Hi @Hannah and @SRv!
Thanks for getting back to me so quickly!
We’re going about this via trial and error — mostly error. 🙁 A racquet ball (diameter: 2.25″ ~ 57mm) seems to fit nicely in her hand.
Thanks for your help!
@aliceJune 10, 2020 at 7:54 pm #8568
will changing the dimensions affect the space to put a pencil/pen at all?June 10, 2020 at 7:54 pm #8569
I’m not sure about this one specifically. In general, a parametric model allows for changes to some parameters while keeping others constant — up to a point, without affecting the integrity of the design.
So yes, I’m looking to put a writing utensil < 10mm in width in the ball.June 10, 2020 at 7:54 pm #8570
Yes, the design is parametric. In the OpenSCAD source file, take a look at lines 11-12:
// ** the two main parameters **
// may produce a useless design, so change at your own risk
ball_diam = 60.0; // 60 mm is default; can go to 45 if wall_thick reduced
pen_diam = 10.5; // should fit most pens; 10.5 mm is default
You can easily drop the diameter down to 57, and `pen_diam` seems to render a good result even if dropped to 5 mm. You *may* need longer screws, though.June 10, 2020 at 7:54 pm #8571
I see! Sorry, I never looked at the code. For some reason, I thought it would be gibberish!
The 10.5mm diameter is good — yes, longer screws. 🙂
For some reason, I can’t seem to reply on the MMC website today. I log in but can’t seem to get back onto the thread. But email works! 🙂June 10, 2020 at 7:54 pm #8572
Hurray glad @SRv could help with this. He’s very good at this type of thing!
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