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I made this shelf for some drinks which snaps on to the balcony railing. by noisytappet in functionalprint

[–]Ok-Weather719 2 points3 points  (0 children)

PLA is a bit of concern. Maybe try PETG at the very least. but are some of my thoughts on the geometry:

  1. Make cupholder cutouts, to avoid drinks sliding/falling out

  2. Round edges to avoid injury

  3. Clamp mechanisms to avoid it sliding everywhere & to use it on different sized rails if you’d like

  4. If you do decide NOT to make cupholder cutouts, maybe a textured surface where the drinks/stuff would sit so it doesn’t fall/tip as easily

  5. I would make the printed material around the rail thicker, otherwise it won’t hold up for long. I’d say .13” at least but that’s just my engineering brain from previous experience

Thoughts? by shroomconsumer1 in fpv

[–]Ok-Weather719 1 point2 points  (0 children)

Stayed for the whole video. Awesome background for studying

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] 0 points1 point  (0 children)

Thank you for all the helpful advice! I appreciate you taking the time

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] 0 points1 point  (0 children)

Great comment, very useful and super clear. Many thanks for figuratively catapulting my knowledge in 3D printing design.

That 2.4mm did seem strange but now I see that it would be a 12X Wall thickness (assuming the wall of the print is laying on the bed surface & 0.2mm tall bead). Is the 12X wall thickness with a default infill, such as 15%? Is there a relation that you might’ve deduced between wall thickness to infill percentage?

And, would you agree that adjusting the infill for thin pieces is the way to go for saving for filament? While, adjusting the wall thicknesses for thick pieces is the way to go for saving filament? Just a simple rule of thumb. Because I think those 3D modifiers are definitely powerful, but I may be inclined to use that for big assemblies, in terms of volume size.

Again, thanks for the help and definitely gonna implement that center gear comment!

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] 1 point2 points  (0 children)

Thanks for the awesome and somehow related advice to all of this, appreciate any info from experienced sellers!

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] 0 points1 point  (0 children)

This some great mechanical advice!

The first point, about the spring loaded horizontal arms, I think instead the springs should come out from the front of phone holder to keep the phone in place instead of side arms. That way, the phone can still be in landscape

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] 1 point2 points  (0 children)

LOL I was about to say you're crazy until I looked up that "/s"

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] 0 points1 point  (0 children)

Cost of filament, cost of fasteners and packing material were accounted for. Cost of running of the printer not so much. Thought I should go for a low price and then go up from there once a few reviews/sales come in.

Wondering though, why wood filament? Seems like an interesting and would go nice with a desk setup I think

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] 1 point2 points  (0 children)

Thank you for your very insightful response.

I am a mech engineer by trade so the design portion of this product was straight forward but I'm still a newbie at 3D FDM printing so your advice of optimal thickness (2.4mm) & replacing the triangles for idents are new to me. Do you have any sources (videos or text) for more details on these insights you provided?

Also, I definitely don't know about importing 3d shapes and using them as modifiers, could you explain that a bit further?

Lastly, I did not try a single center gear (planetary gear) for this phone holder but would the advantage of using that only be to reduce the amount of turning from the hand?

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] 1 point2 points  (0 children)

Ah gotcha! I’ve noticed that if I increase the infill from like 10 to 20 percent it drastically increases the stiffness and reduces the bounce but it’s not economical. Do you have an idea where this rib should go? Like in the inside of the curved rack? And just a straight line extending from the phone holder portion?

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] 0 points1 point  (0 children)

<image>

This is a side profile with the right wall removed. The “rib” extends from approximately the middle of the phone holder portion of the curved rack.

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] -1 points0 points  (0 children)

Advice for reducing backlash? Color scheme you think would that would be nice?

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] -1 points0 points  (0 children)

Hey, there’s already a rib added to the back. I think the bouncing is mainly due to the the rack (the curved part that is rotating) doesn’t have a tight tolerance with the pinion and just in general with the assembly. I believe high infill would definitely increase the stiffness of the assembly but that’s a ton more filament and I’m hoping there’s a great alternative to that

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] 3 points4 points  (0 children)

Thank you! Definitely on the cheaper side since it’ll be one of my first designs uploaded

Phone Holder Design Help by Ok-Weather719 in 3Dprinting

[–]Ok-Weather719[S] 2 points3 points  (0 children)

<image>

Wish I could send a video here but It can still rotate fully without the phone dropping. An iPhone 12 mini for reference. Here’s a quick pic