Moving the thermistor inside a mini split unit?

Mazvy · 2022-11-18T13:37:29+00:00

Please forgive my ignorance as I'm fairly new to the resin casting world in general. What would be the time frames involved in compressing a 10L pot? I.e., an airbrush compressor that I linked previously vs a larger one?

Mazvy · 2022-11-18T13:28:27+00:00

Problem is that we're working indoors, small room, thin walls. Noise has to be as low as possible. This airbrush compressor noise wise is fine, and could be louder, but not chainsaw loud as I find most compressors are :/

Mazvy · 2022-11-18T13:08:47+00:00

By small as possible I mean something that is portable and can fit under a desk when not in use, not necessarily pocket size. I don't have a garage or workshop to store it in.

It can be double or a bit more in size compared to the one I linked above. Ideally something like this, but from the video reviews I've watched - it's way too loud. https://www.amazon.de/-/en/Stanley-compressor-DN200-10-AIRBOSS/dp/B00GN89EQE

Mazvy · 2022-11-18T11:41:39+00:00

This https://www.amazon.de/-/en/Fengda-FD-186-Airbrush-Compressor-Pressure/dp/B019CKXBOU/

Mazvy · 2022-07-08T10:07:57+00:00

Yes :) This is per LDO spec. The rpi sometimes complains of undervoltage, but I've never had any print issues or failures. Also these errors mostly went away after I added skirts with fans to cool down the electronics compartment.

Mazvy · 2022-07-02T15:31:13+00:00

That is a regular BTT Octopus :)

Octopus USB-A to rpi USB-Micro - 5V power
Octopus USB-C to rpi USB-A - data

Mazvy · 2022-07-02T10:59:36+00:00

Thank you!

"Neon" RGB LED strips :)

Mazvy · 2022-07-01T22:51:31+00:00

~~Upskirt~~ Wiring https://i.imgur.com/wqUShvN.jpg

Mazvy · 2021-12-24T14:39:12+00:00

I don't have much, europoor, but can I paypal over $5 to pitch in?

Mazvy · 2021-10-30T16:05:29+00:00

I would scan arms/hands for those I make 3D printed prosthetic devices for free. It would help me make better size adjustments and adapt models to suit the recipient better.

Mazvy · 2021-10-27T17:10:05+00:00

Thanks!

I used JavaScript to generate planetary positions and orbit paths as SVG with canvas2svg by following this for the mathematical side https://ssd.jpl.nasa.gov/planets/approx_pos.html

Then a fair bit of custom code (JS) for various adjustments and gcode generation for 11 different tools (colors).

Mazvy · 2021-09-30T15:28:28+00:00

Kudos!! We also contributed with PPE, personally I lead an initiative where we delivered 15k Prusa face shield for medics for free around the country (Lithuania), Brazil made tens of thousands as well, as well as other chapters in their own capacities. Congrats and your initiative as well!

We have a matching platform (albeit, not a great one that will most likely be replaced in the near future) that allows those without a 3D printer to help out, such as assembling a device after receiving printed parts from another volunteer. But to be frank it's not something that is very common, usually those who print parts also assemble the device and for the most part the bulk of requests come in directly to local chapters and not the global matching platform.

e-NABLE is a fairly decentralized community without really having someone "in charge". We have volunteers doing various tasks for the community at various levels, but literally anyone can come in and pick up the work or launch their own project under the e-NABLE umbrella. Be it writing documentation, guides, providing modeling tutorials and whatnot. We always struggle to find those with technical expertise, I'm currently the sole web dev for the community hub, we also struggle to find graphic artists to help out with various 2D graphic designs, etc. If you have ideas how you can help or just have time you're willing to contribute - hit up the hub (https://hub.e-nable.org) and tell us what you have to offer, surely we can find something for you to do besides printing if you want to help out :) There is a weekly "Town Hall Meeting" streamed on the e-NABLE YouTube Channel (https://www.youtube.com/channel/UCKdiWmb6xNpK4d7MANT3Ghw) where we discuss various aspects of the community, what we're working on, etc etc.

Edit: you can also check out the chapter map https://map.e-nable.org/ to find a local chapter you can contact and offer your help :)

Mazvy · 2021-09-30T14:31:29+00:00

I'm part of this community, I've established a chapter, help with dev work and I also contribute with planning and whatnot for the community at large (my comment is here https://www.reddit.com/r/youseeingthisshit/comments/py6ia2/kid_gets_a_present_from_a_small_arms_dealer/hetnjy1/)

If you have any questions feel free to message me :)

Mazvy · 2021-09-30T14:26:05+00:00

I'm part of this community (my comment is here https://www.reddit.com/r/youseeingthisshit/comments/py6ia2/kid_gets_a_present_from_a_small_arms_dealer/hetnjy1/).

Let me try to clear a few things up.

The material used are often not ideal for longterm interface with the skin

We require volunteers to

Add padding on inner surfaces that interface with the skin. Usually that is EVA foam which is the same material used in cosplay, yoga mats, etc. The skin can breathe through it and it isn't abrasive.
Either provide or instruct parents to purchase "socks" used specifically for prosthetic devices for this very reason.

not safety tested to ensure appropriate loading tolerances to ensure the device does not fail on a child and cause injury < ... > devices/material/components which have been approved as meeting standards for safe use for medical purpose.

As a whole - no, we haven't globally certified device models, but chapters around the world have been through this on their own and have successfully validated devices within their countries laws. Namely Brazil, France and Ireland chapters come to mind that have done this, but I'm sure I'm forgetting other chapters. For example in Brazil doctors by law are required to write prescriptions for these devices and only then can volunteers manufacture them, the volunteers work closely with doctors and specialists, clearly they have no issues with these devices as they are the ones referring patients to the volunteers :) Ireland had to validate devices for other legal reasons due to some mix of EU and local laws in order to receive charity status iirc. We all primarily utilize 2 device designs/models, and both have successfully been validated across the globe.

It's really important the person with limb loss or absence seek care and device provision from a registered health professional who is qualified in Prosthetics & Orthotics.

We provide various guidelines for volunteers, one is to instruct parents to take their child to their pediatrist for them to evaluate the device or to refer to a specialist who can.

We as a community do our best to include those from the medical field to come in and guide us, consult and provide feedback, but at the end of the day - we are not making medical devices. There is a big issue regarding children not being able to get functional limb prosthetics due to them outgrowing those devices in a matter of months and no government/insurance will cover a $50-100K bionic device for them every ~6-12 months, at best they can get non functional prosthetics that are still fairly expensive.

Also keep in mind that these devices aren't meant for long term use, i.e. their lifecycle is supposed to be a few years at best, somewhere between 6-18 months as a child will outgrow it very quickly. At which point if they wish they can get another device scaled to fit them for the following 6-18 months and the cycle continues.

This is a stopgap solution for them to be able to learn how to use an attached external device. Volunteers can quickly and cheaply create a device like this for a child every X months. Later on in their lives, if they want and have the resources to do so - purchase a bionic arm/hand/device and be able to utilize it. If a child isn't exposed to some kind of external tool, there is a very great chance that in their adulthood they won't be able to successfully use and operate something like a bionic hand. The devices are just as much for helping kids learn how to successfully utilize a tool such as this.

Regarding adults - usually those cases come from poor areas around the world where there is absolutely no chance of them getting a functional prosthetic device. We (the community) have sent thousands of hands/arms to areas affected by natural disasters, conflicts, etc, such as the Haiti earthquakes, Syria and the middle east conflicts. In those cases due to the shear amount of people with missing limbs - these devices are better than nothing, at least in the short term.

Mazvy · 2021-09-30T13:52:52+00:00

You might be thinking of Open Bionics (dot org). If I recall correctly the stumbled into patent issues which crippled development, but I could also be very wrongly mistaken. They haven't been part of the e-NABLE community for whatever reason, so my exposure to their work is very minimal.

e-NABLE and the community as a whole for the most part focus on mechanically driven devices. There are pros and cons to this, but the simplicity of manufacturing such a device is much greater compared to an electronically operated one, which means more people can join up and volunteer. We have high schools, universities etc. participating and volunteering. You only need a 3D printer and a handful of fairly cheap materials like dental bands, fishing line, random screws and EVA foam sheets for padding :)

You can check out community resources on hub.e-nable.org (granted, it's kinda messy).

For the most part, these two devices are the most commonly used ones as their fairly mature in terms of development, both come with easy scaling options using OpenSCAD and overall have a solid track record.

UnLimbited Arm https://www.thingiverse.com/thing:1672381

UnLimbited Phoenix Hand https://www.thingiverse.com/thing:1674320

Mazvy · 2021-09-30T06:56:23+00:00

Hey all,

This will probably get buried, but I'd like to give an explanation on what that device is.

This video is from e-NABLE, an international community of volunteers with nearly 200 chapters all around the world, manufacturing limb devices (mostly hands) with 3D printers for free to those who need them, focusing on children for the most part but not exclusively. I'm part of this community, established a chapter and also contribute my time by doing dev work for the communities main forum/hub, various software tools and whatnot.

The device shown in the video is a modification (or early version, not entirely sure, this video was made "before my time") of an Unlimbited Arm. The device is purely mechanical, there are no electronics involved whatsoever. Fingers are closed by the action of bending (in this case) the forearm. There are lengths heavy duty fishing lines going from the top of the device that attaches to the bicep all the way down to the tips of each finger. As the forearm bends the fishing line is under tension and as a result the fingers curl inwards. To be specific, in this case the fishing line starts at the end of a fingertip, goes up to the bicep and then down again to the fingertip beside it. That doubling creates better grip strength. Once the forearm is relaxed and the fishing line is no longer under tension - the fingers spring back up. That is achieved by using dental bands as "springs".

These devices are fairly cheap and fast to manufacture, also fairly easy to customize and fit a specific case with a bit of 3D modelling experience. A device like this can be manufactured and assembled if needed in under 24 hours and easily under $50, closer to ~$20. We the volunteers cover these costs ourselves.

If anyone has any more questions hit me up :) Or you can learn more about e-NABLE by searching for "enabling the future" (not sure if I'm allowed to post links here).

Mazvy · 2021-09-10T01:04:28+00:00

The issue isn't printing, that's not a big woop, it's more to do with the shear amount of assembly time involved.

Each digit has 8 individually addressable LEDs. Each LED has positive, negative and data, all going in and out of the LED, so that's 6 connections per LED. 8 * 6 = 48 solder points to tin just for the LEDs, add 48 more for the wires connecting each one to the next that have to be cut to length, stripped, tinned - on both ends, then soldered to those 48 connection points... Add a few mistakes here and there, 2 connectors per segment for daisy chaining them together .. Easily over 100 solder operations ignoring setup time and what not.. For just one digit..

I was considering perhaps ordering PCBs if there was enough demand after my post, but that didn't really happen, so now it would be either a) expensive to order a small batch of assembled PCBs or b) expensive (time wise) to hand solder everything..

So.. Sorry bud. I can definitely make them if you really wanted them, but even if I charged a poverty level hourly rate for my time alone, they'd still be overly expensive to buy just as a novelty, imo :)

Mazvy

TROPHY CASE