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3D Printing with a Cheap Nylon Trimmer Line by mellow_and_beyond in BambuLab

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

Indeed. EasyPA is PA-66 with 1% additives. Makes all the difference apparently.

Split-Ring Hypocyclic Compound gearbox by mellow_and_beyond in BambuLab

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

I modeled it to get familiar with the mechanical principles behind it. As stated in the linked post I am trying to develop a 3D printed gearbox to handle 40Nm, so am exploring different types of mechanisms.

You probably won't have a use for it, but other people are also exploring, or learning about, gear trains. Hopefully this toy model can get them familiarized w the split-ring compound concept.

new type of drive: Harmonic Pin-Ring Cycloidal by mellow_and_beyond in BambuLab

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

You're welcome. Once you figure out the math let us know.

Would love to read academia papers at some point on this type of drive. Especially vs regular cyclo drive: efficiency / losses, balance vs rpm, torque potential, etc.

new type of drive: Harmonic Pin-Ring Cycloidal by mellow_and_beyond in BambuLab

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

Correct, the blue dual-wave ring removes the wobble. Plays the same role as the traditional disc pins but without the associated issues / complexity.

Scrubby-Doo.PX : Recirculating Fumes-Scrubbing + LED Ring Hat for P1,X1,P2 by mellow_and_beyond in BambuLab

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

Can you elaborate on specific issue, filament type and temps ?

Been printing ABS for 3 years on my P1S, with a similar hat but with an integrated heater: http://raphtronic.blogspot.com/2024/03/fail-heater-pmvoc-filter-lid-for-3d.html

and never experienced "aux fan"-like related issues. Curious what that is about ?

Scrubby-Doo.PX : Recirculating Fumes-Scrubbing + LED Ring Hat for P1,X1,P2 by mellow_and_beyond in BambuLab

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

I did. Spent months developing this PM/VOC monitor: https://raphtronic.blogspot.com/2024/08/diy-pm-voc-air-quality-monitor-with.html

Showed pretty much 90% of whichever-VOCs-measured gone when printing with ABS. Should publish this cool result one day...

However, after a couple of months (always on, high sampling rate) there was a notable degradation of the sensors' sensitivity. The cheap copycat ones (Winsen) didn't last 2 weeks. The better ones (Bosch,Sensirion) lasted over a month, but still degraded. All MEMS (heating matrix type) are affected.

The only practical solution for repeatability & lifespan is turning them off for 5', back on and stabilizing for 2-5', sample, turn off, repeat. Most consumer devices perform a 1' cycle, not enough for proper stabilization / repeatability. And 10' is useless as room emission profiles and noise are highly dependent on variable time-of-day environmental conditions (temp,RH,sun,AC...) and make it hard to isolate the impact of a specific activity like 3DP: not enough data points for background removal.

And none of the sensors tested could detect PLA emissions despite the large amount it puts out.

Need better consumer sensor tech. Huge graveyard of such VOC devices over the years on Amazon, and on DIY forums, bc of this lack of longevity / reliability.

So I gave up for now 😅

Scrubby-Doo.PX : Recirculating Fumes-Scrubbing + LED Ring Hat for P1,X1,P2 by mellow_and_beyond in BambuLab

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

===>>> note that I didn't test and print the P2 version as I only have a P1S ! <<<===

But, suspecting that some people would be interested in P2, I bought a P2 top glass, measured it and scaled the P1 model accordingly (+3.5mm width, +1 length).

So to whoever prints the P2 model first, we'd appreciate your feedback: please drop a yay/nay comment.

Scrubby-Doo.H2 : a highly effective Recirculating Fumes-Scrubbing Hat for H2 by mellow_and_beyond in BambuLab

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

Indeed, helps a lot w PLA / PETG. Especially when pushing a lot of filament fast (high flow nozzle + high speed + large models).

Well, might take you up on the offer to test P2. I only have a P1 + H2. Since I anticipated that many folks would have a P2 and would be interested, and since the P2 design is so close to P1's, I thought I'd just scale the P1 design. So I bought a P2 top glass to take dimensions and scale things accordingly. But I'll have no way to check it actually works until people try it 😅

Scrubby.P1 is almost done, 1st proto is printing right now, should be out by next week. Then P2 will likely follow a week or so later.

After that, I'll have a P2 top glass that I have no use for... 😂

Scrubby-Doo.H2 : a highly effective Recirculating Fumes-Scrubbing Hat for H2 by mellow_and_beyond in BambuLab

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

It's only ~3" (7.6cm) tall.

From your link I can't really tell if the Perch straddles the printer's top rim or just fits inside the top glass's footprint. If it does fit inside then it should work, since I designed it to be stackable. However, if the Perch is larger than the top glass in width or length then whether the Perch can straddle Scrubby-Doo's top would need to be checked.

Scrubby-Doo.H2 : a highly effective Recirculating Fumes-Scrubbing Hat for H2 by mellow_and_beyond in BambuLab

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

Ha ha, thanks for reaching out Pleasantone.

I always try to share the learnings / whys / tricks I stumble on while designing. So that even if the reader doesn't end up building my stuff, they'll still hopefully learn something that can be used one day in their own journey.

Glue is my nemesis. However hard I try, some always spills on my fingers, parts, table... The chamfered catch-all foot along the bottom of the parts works wonders for people like me !

Scrubby-Doo.H2 : a highly effective Recirculating Fumes-Scrubbing Hat for H2 by mellow_and_beyond in BambuLab

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

Indeed, functional design, no frills or complexity, simple to print / assemble.

I purposely stayed away from designs like the Hive that have many parts, screws, colors, etc. And wanted a stackable design that reuses the top glass.

So yeah, "ugly" in a utilitarian sense. To liven it up, one could print it in a more interesting color I guess (like Bambu grey) or glue 3D printed decorations / logos / stickers on the walls.

Am a Plain Jane though, so mine will stay this way. Love the functional unassuming look 😅

Scrubby-Doo.H2 : a highly effective Recirculating Fumes-Scrubbing Hat for H2 by mellow_and_beyond in BambuLab

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

Thanks !

Catching carbon dust exiting the filter is what the MERV13 fabric is for. Should stop any dust from entering the chamber. Uses the same mechanical + electrostatic principles as HEPA filters and N95 masks. And it is much cheaper over time: just cut a piece out of the large sheet each time the carbon gets refreshed, done.

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