If we have ball-park dimensions, I can 3D model it lol
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haha, yeah. Thats how Val created this shell.
Not Available? Was checking if I should try the Qian39 again for testing the fit (
) and saw it on Ali.
oh seems it back, but at almost twice the price lol.
Nah, can better save the 15€ and buy your model later.
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uhhh, just ordered the Fostex T20RP MK3.
Im loving the fostex bass I got from their bud driver (modded ShoonTH) and the Denon D5200 (which probably has some cues from their old partnership with Fostex).
Will try modding the T20RP MK3, maybe I can sell the modded version if its worthy. 
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I assume you are about to get it printed in SLA or DLP technology?
Just keep in mind that most of the easily available resins are not suitable by design (or at least not tested) for direct skin contact and may cause irritation on prolonged usage due to the uncured resin particles getting dissolved in body fluids (sweat etc).
Also they may be quite brittle and potentially age with prolonged UV exposure.
Something to be tested at least
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True, although I havent heard any issues from Val so should be good.
These are important points! If it’s thoroughly washed in isopropanol after initial cure, post-cured, and washed again, should be ok. Could also wipe down the outer layer or paint? maybe
Oh yes, indeed SLA printing. I see that no biocompatibility was tested (which is quite obvious since it costs $$$ and it is only required for medical-grade ones), but it is not food safe. It might mean that there would be free resin particles that you can get exposed to when in contact and that may cause allergic reaction to the most vulnerable (like some small percentage of whole population). It may be ok for all your users, but in general this is the particular reason why most companies using resin shells claim they use some kind of medical-grade versions of available materials 
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Gracias! 
Did you install the tuning foam with no filter on top of it?
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yeah, remove the filters and stuff the tuning foams in. Done.
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So I am not much of a reviewer but I’ll share my thoughts and impressions of the Rikudou Buds Grand Rider 1’s. I received these about two weeks ago, and until my most recent arrivals (electrostatic headphones and an amp to go with it) they were the only transducers that I was listening to. Keep in mind that these thoughts and impressions are according to my perception of sound and my preferences. Also, I have learned that I much prefer ear buds over iem’s for comfort but iem’s are still useful for providing some sound isolation.
These buds are fantastic. They provide a great soundstage both in depth but especially width. The sound stage feels natural and does not take away from the excellent tonality of this set. The set has been described as warm leaning but doesn’t feel that way to me. It sounds very balanced for me when using the yellow foam covers. The imaging is good but not excellent, but it isn’t something I notice as not being exceptional as this set provides a very cohesive sound.
Compared to my other recent gear:
Thieaudio Oracle - I found the GR 1’s to simply be a more enjoyable experience. The GR 1’s have better technicalities in general and to my ears had more treble and less warm leaning. A plus for me. Recently sold my Oracles to fund new purchases as they weren’t getting any ear time.
Olina’s - No contest for me, the GR 1’s. I am keeping my Olina’s. They will be my comfort iem for when I need some sound isolation.
Focal Clear Mg - So a lot more expensive and the only thing the Mg’s were better at was bass slam. The Mg’s sound overly warm, and while the imaging is better on the Mg’s, the headphone itself is only nice to listen to with EQ. I recently sold these too after having them for a year.
Grado RS2X - These has been a huge surprise to me. Using 3rd party G pads, these have great tonality, awesome bass texture. Love these and didn’t expect too. Very good sound stage as well. The GR 1’s and RS2X’s are very similar but of course present the sound differently with one being buds and the other is an open back headphone. Love these and keeping them.
LSA-2 Closed Back Headphone - Tonality was never right with these and they have great imaging but just sound wrong. To make it worse, they have developed a severe imbalance on the left side. I need to get these replaced before giving them another listen. Might eventually sell them.
I have other gear but I’m not going to comment on all of them.
Finally I used the Gr 1’s using Fiio BTR5, apple dongle, Schiit Jot 2, Fiio K9 Pro AKM edition, and Zen Dac and Zen Can and loved it on all of them. The apple dongle is barely able to drive these buds to a satisfactory quality but not as well as any of the other dac/amps.
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Unique colored foams (not black or white) are usually lower density than usual, with the black ones, it should be leaning more towards warmth.
Thanks for the review! 
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Hey everyone! Im this Val person Riku has been mentioning and I do design/release files for open source earbuds!
Some here already know, and I already see some familiar faces but its cool to be here!
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Welcome! I also tinker with SLA/FDM 3D printing, so let me know if you ever wanna chat about designs and prints
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Great to see fellow designers here have you done any iterations of MX500 buds’ shells without the stem to see how that affects the acoustics? I find the stem to be the most uncomfortable part of the buds and I can only understand that it is necessary for the sake of having desired sound (and maybe for easy guide of the cable direction and securing of the wire without the need of rubber cable gland)
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Seems like we came to the same conclusion 
I also love my Olinas but the GR1 has now taken its place even though it’s less technical. The tuning is simply fantastic.
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