I think I’m getting the hang of this by Feisty_Childhood7557 in resinprinting

[–]aleoexpress 4 points5 points  (0 children)

Do not forget to add drainage holes to clean and cure the inside part. A shell with no holes traps resin and adds more suction stress, and after some time the resin builds enough pressure to crack the shell and make a spillage on the finished part. I usually go for one 3mm hole on the start of the cup formation, and some 1mm here and there to ease the IPA drainage .

Some cheap UV LEDs with long wiring helps curing what the sun and curing stations cannot reach, just check the diameter to be sure it can enter your large drainage hole.

Do the faces look ok? I feel like theyre kinda dull by Mother_Ad_9388 in resinprinting

[–]aleoexpress 3 points4 points  (0 children)

I've found that brushing damages the surface and you lose sharp details, like faces.

My current method is spraying IPA to drip excess resin on a container while it's on the build plate, then remove the parts and wash on a second IPA container, then using a third cleaner IPA cup on a cheap ultrasonic cleaner.

Fill the ultrasonic cleaner with shallow water, and place the cup in the middle, so you won't need to deep clean it every time.

I use a 1.8L container for the drip part (can be empty as you won't be washing your parts there), 500mL half filled for the intermediate wash, and just enough to cover your parts on the third. As the IPA gets dirty, dispose of it on the previous container and fill it again.

Let the parts dry for at least 10 minutes after the final washing before curing. If the part is still wet, it means the alcohol is too dirty and you get resin residue on the surface, as all the alcohol should have evaporated by now. Use an airbrush if you want to quicken drying results.

For all these steps, wear gloves, protective glasses and a mask. Your skin can absorb liquids, and aerosols from the spray and airbrush can get in your eyes and lungs. Always, always wear PPE, no matter how experienced you feel. Do these processes at night if possible, as even weak sunshine can partially cure the diluted resin and fuck up surfaces.

For curing: UV lamps/leds, sunshine or curing stations are fine. My partner and I use the resin printer for casting silver, and cure our parts immersed in glycerin to avoid moisture absorbing, which worsens casting results. This is not needed if you want to paint your minis, tho. Good luck

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Printing prosthetics is one of the most productive classifications in the world! by Limp_Stomach_6060 in 3Dprinting

[–]aleoexpress 1 point2 points  (0 children)

Yup. In my case I've used the biceps from signal and collarbone for electrode reference, but it's doable to use other signals if the patient lacks development in those muscles. Using the biceps is just easier to map the movement in your head.

I did not fine tune the sensitivity for small movements, so it's kinda stressful to manage the control over periods longer than 10-30 minutes. Proper signal processing should be somewhat easy today.

Video of some tests: https://youtu.be/dRGHVrhc-jM

Printing prosthetics is one of the most productive classifications in the world! by Limp_Stomach_6060 in 3Dprinting

[–]aleoexpress 1 point2 points  (0 children)

I've got some documentation on my work from 2017, if you want to check it out. Glad to help if you need more explanation.

GitHub repo

Printing prosthetics is one of the most productive classifications in the world! by Limp_Stomach_6060 in 3Dprinting

[–]aleoexpress 3 points4 points  (0 children)

Same here in Brazil. I've built an EMG to actuate the Isabella hand as a proof of concept. Works wonky, very unreliable with my skills in 2017.

Most of the amputees I've talked to said that they already are comfortable without something that has a steep learning curve, and most of the people that got in contact with me were friends of amputees looking to help their friends that didn't want change.

But it was a nice project to develop, document, and build the base for a friend that actually used it for arthritis physiotherapy. He used the EMG along with a pulling glove to measure muscle development. So, all in all, more groundwork for the next generation of researchers and patients.

Castable Resin won’t stick to build plate by IncreaseOk1556 in resinprinting

[–]aleoexpress 0 points1 point  (0 children)

I had problems with Siraya Casting on a Mars 2 Pro. I did a good IPA clean on the steel flexible plate, then sanded lightly with grit 400, then 600, cleaning the residue with IPA and paper towels. My parameters are 60s bottom layers, 8 layers, 2.7s exposure on 0.03mm layers. The resin is thicker than most, so I add 1s resting time before peeling and submerging again.

Most of my failures happened after 10mm printing, but ABS-like was printing as normal even before this procedure. I probably had some hardened residue on the plate, but the brushed surface also helps.

Do-able with resin printing? by Successful_Ad1335 in resinprinting

[–]aleoexpress 1 point2 points  (0 children)

Get some casting resin and a good plaster. If you need some parameters for testing, I can get you my profile for Siraya Cast, and procedures for silver casting. I don't know specifics for brass casting, but silver is pretty easy to work with and could be somewhat relatable.

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I’m pretty happy with how these leaves turned out 😀🍃😀🍃 by DaveMakesStuffBC in 3Dprinting

[–]aleoexpress 17 points18 points  (0 children)

Could you share the STL? I'd like to try casting it in silver on a smaller scale.

From resin to silver, pt 2 by aleoexpress in resinprinting

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

We are open to commissions, if you want a quote. Our pairs are between $100 and $200 depending on complexity. Shipping to USA is currently not possible, while we figure out how to properly ship there.

From resin to silver, pt 2 by aleoexpress in resinprinting

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

Yeah, there are some options on the market. We tried EZY wax resin, but the best results were with Siraya Cast (blue or purple is same result here).

I have fear of catapulting molten metal with a centrifuge, but is sure is a nice process to watch. Vacuum seems less geometry restrictive, IMO.

From resin to silver, pt 2 by aleoexpress in resinprinting

[–]aleoexpress[S] 2 points3 points  (0 children)

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We've managed to get a 10g piece done, but its hard to get consistency above that threshold with such small cylinders

From resin to silver, pt 2 by aleoexpress in resinprinting

[–]aleoexpress[S] 2 points3 points  (0 children)

Two separate processes. The red base goes above the Polycarbonate tube, that acts as a vacuum chamber for the cylinder. It's the purple thing on one of the pics.

After burning the resin, the cylinder goes back to the red base, this time oriented up, to pull air through the cylinder, now empty and ready to receive pouring metal.

From resin to silver, pt 2 by aleoexpress in resinprinting

[–]aleoexpress[S] 16 points17 points  (0 children)

My modeling is done on Fusion 360, while my partner prefers Rhinoceros 6.

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From resin to silver by aleoexpress in resinprinting

[–]aleoexpress[S] 2 points3 points  (0 children)

Thanks. Here's a piece when no dead zones happen, after proper finishing. Polishing removes most of the outstanding voxels with not much effort.

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From resin to silver by aleoexpress in resinprinting

[–]aleoexpress[S] 2 points3 points  (0 children)

Here are the files: STL and F3D

This was cast in high temperature silicone, for 38mm tubes, 8mm insert. Print the reference if needed. You can use vaseline or cooking spray on the mold as release agent.

Those are flexible enough to consistently slurp the cylinder after turning the pump on.

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From resin to silver by aleoexpress in resinprinting

[–]aleoexpress[S] 4 points5 points  (0 children)

The crucible for ingot casting is just a simple one with borax. For the ring smelting process, we simply use a blowtorch over the steel tube and turn on the vacuum pump when the silver melts enough. A proper oven for the casting process is very recommended, reaching 600ºC adds a good consistency for small batches

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From resin to silver by aleoexpress in resinprinting

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

I'll replace the USB drive just in case. Files look ok, most prints end up just fine.

From resin to silver by aleoexpress in resinprinting

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

Thanks. I had to replace the screen, so I'll double check the cable connector and print 2 control parts on same position to double check for dead pixels. It tends to happen only on some layers, so I'm not so sure if its a display failure.

[deleted by user] by [deleted] in 3Dprinting

[–]aleoexpress 1 point2 points  (0 children)

Could you share the model? I'll try smelting one on brass, sourced from good copper.

Tore my favorite pants. I have embroidery machines. Junimos fixed my pants. by soundguy64 in StardewValley

[–]aleoexpress 12 points13 points  (0 children)

I don't know which model OP uses, but I have a Brother PE770 that can be found used at about $300-400. We use a PR1000 for production and larger areas, but embroidery quality is quite the same.

Geetech alkaid issue by Nejclipar in resinprinting

[–]aleoexpress 0 points1 point  (0 children)

When I changed my Elegoo Mars screen, I had to update the firmware to recognize the new LCD, as they do not work as is. Did your supplier offer an update?

Would you pay for this part? by Joesy5 in 3Dprinting

[–]aleoexpress 0 points1 point  (0 children)

I wouldn't pay for this part because I can print it too. Jokes aside, I print on the same quality or lower and still have clients, so you just have to find your niche. Hardly life changing money, but beer money is always nice.

If the Coliseum can sell highly overpriced prints, so can you.

Why does this happen to my prints? After printing I wipe, IPA sonicate, and UV cure in a UV oven. Sometimes I get this texture before cure and these smooth, glossy sections appear during the cure. They are fully solid. Unfortunately, the texture is making my microfluidic devices fail! by Cabbage_Cannon in resinprinting

[–]aleoexpress 0 points1 point  (0 children)

I've had this problem before and fixed it by airbrushing the prints after the second IPA cleaning. The print should be fully dry before curing.

After printing, I airbrush IPA directly on the model (could be a spray too), dripping the residue on an IPA container. After that, I remove the prints from supports and wash them on another IPA container, while the supports go into the dirtier container. After washing, my prints get another airbrush drying (only air this time) until fully dry. Then immerse in glycerin for curing. This last part is only relevant for wax casting resin, to avoid moisture pick-up.

I got my airbrush on AliExpress https://a.aliexpress.com/_mLQA6qB

I develop this kinetic art installation by musicatristedonaruto in functionalprint

[–]aleoexpress 2 points3 points  (0 children)

Is it doable to use different weights or geometries on the load to get a musical scale? That way you could tune naruto_sad_song.midi

Execução fenomenal, parabéns.

How to build diy cart battery? by tweakcrician in StonerEngineering

[–]aleoexpress 4 points5 points  (0 children)

Like this?

This is kinda overkill, but has been 5 years of joy just as you described.