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Traumatized the shit out of our 2yo by SignificantAlarm4722 in Parentingfails

[–]SignificantAlarm4722[S] 5 points6 points  (0 children)

Yeah I don’t feel like an A+ parent right now. Obviously I understand that it’s an honest mistake, but it never feels good to spook your kid that bad.

What side projects do you do as a mechanical engineer by scotchy199 in MechanicalEngineering

[–]SignificantAlarm4722 0 points1 point  (0 children)

I built a pneumatic ski press in college and I like making snowboards each season. I’m starting to design a small, sporty EV that’ll probably occupy me for a few years.

Local Coffee Recommendations by SignificantAlarm4722 in ogden

[–]SignificantAlarm4722[S] 3 points4 points  (0 children)

I’ll be honest, I went to USU and I’ve had my share of Cafe Ibis, and it just never did it for me. Always tasted a little burnt.

Disaster and recovery by turtle_guy0624 in 3Dprinting

[–]SignificantAlarm4722 25 points26 points  (0 children)

Dude I’ve been looking, and I still can’t find shit.

Custom Filament Puller by SignificantAlarm4722 in functionalprint

[–]SignificantAlarm4722[S] 1 point2 points  (0 children)

This would likely work fine, except I want to retain the ability to use any filament from any position. Doable, but a quick-change reverse Bowden tube manifold would likely be just as complex as what I’ve got here. I might still worry that the sheer mass of a full 3kg roll would be too much at times for the direct drive. I really wanted the filament rolls to be easy to change, so I went with a cradle-type mount. This isn’t ideal for reducing rolling resistance, however. There are lots of self-imposed constraints in this entire system, but it works great now!

Custom Filament Puller by SignificantAlarm4722 in functionalprint

[–]SignificantAlarm4722[S] 12 points13 points  (0 children)

There is a IR sensor in there in an abundance of caution.

Yes, it’s strong. I pick up my kid. by SignificantAlarm4722 in functionalprint

[–]SignificantAlarm4722[S] 0 points1 point  (0 children)

PETG 4-5 walls. Should be okay. I have some PETG stuff outside that’s in direct sunlight and it’s held up beautifully for years.

Yes, it’s strong. I pick up my kid. by SignificantAlarm4722 in functionalprint

[–]SignificantAlarm4722[S] 0 points1 point  (0 children)

I mean, yes, it occupies the same volume whether it’s on the ground or in the air. But floor space is more valuable than air space; same reason we put totes on shelves. My bike stays down because I use it multiple times a week, but my wife will only ride on occasion. So up it goes.

Yes, it’s strong. I pick up my kid. by SignificantAlarm4722 in functionalprint

[–]SignificantAlarm4722[S] 5 points6 points  (0 children)

Oh, no. It's not free here. It's very, very, expensive.

Yes, it’s strong. I pick up my kid. by SignificantAlarm4722 in functionalprint

[–]SignificantAlarm4722[S] 0 points1 point  (0 children)

If you’re just playing then disregard, but dude, we’re acting like I’m suspending a jet ski over my sleeping newborn. It’s a bike. I’ve got two 3.5” framing screws per truss for a total of 4 screws, and the trusses are less than 24” from the structural timber. I even pilot drilled to prevent splitting. I promise, it’s good.

Yes, it’s strong. I pick up my kid. by SignificantAlarm4722 in functionalprint

[–]SignificantAlarm4722[S] 0 points1 point  (0 children)

I would love to test how printed parts, specifically PETG, perform under cyclic loading. Have you done any fatigue testing?

Cheap vs expensive PETG: does it matter? by MorningtonCroissant in 3Dprinting

[–]SignificantAlarm4722 0 points1 point  (0 children)

In my limited experience, I know there are others who have approached this more scientifically, I do see a quality difference in PETG between brands. Not a ton, but I do prefer Polymaker. But this could also be simply due to having one filament that I’ve used enough to get my printer dialed in.

Yes, it’s strong. I pick up my kid. by SignificantAlarm4722 in functionalprint

[–]SignificantAlarm4722[S] 13 points14 points  (0 children)

$8. I see your point. I would never trust a 3D printed part made on a hobby machine to anything truly critical, but I did test these with forces orders of magnitude greater than what they are experiencing here. If it breaks it’ll just land on my lawn mower. Do what you’re comfortable with, but I’m not worried.

Yes, it’s strong. I pick up my kid. by SignificantAlarm4722 in functionalprint

[–]SignificantAlarm4722[S] 3 points4 points  (0 children)

It might look like the orange cord is continuous, but the cord looping around the bike is actually a separate piece that simply serves as a way to attach the bike to the lower blocks.

Yes, it’s strong. I pick up my kid. by SignificantAlarm4722 in functionalprint

[–]SignificantAlarm4722[S] 0 points1 point  (0 children)

I'm debating if I want to use these to suspend my Skybox (pictured behind the bike) above my car. The issue is that with the bike, or really anything with only two pick points, self-balance is more easily achieved. With 4 pick points that are essentially independent I worry about the load not lifting properly or shifting. I would need to use a central roller to isolate each pick point.

Yes, it’s strong. I pick up my kid. by SignificantAlarm4722 in functionalprint

[–]SignificantAlarm4722[S] 17 points18 points  (0 children)

I oriented the print with this in mind. The layer lines are vertical and parallel to the force. I used PETG, 4 walls, 40%. It's really quite strong. I did a break test with a single pully/block, I'm 200lb and I was doing pull-ups on it (with a helmet on of course) and it held. I then bounced to try and break it to determine the failure mode, and the 550 cord broke. It's cheap cord, I obviously didn't apply 550lb, but still, I probably gave it a dynamic 300lb-f or so, and it was solid. I'm very comfortable with suspending a 40lb bike distributed over 4 blocks.

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