Do you think that there are going to be extra bearings for purchase in the future? I’ve been eager to design something for one of the 4mm MR85 bearings
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I can point you to the factory that made them. I had them make 100 for me a little while ago.
kudus to Glen though because I’ve made dozens of 3d printed designs using the bearings and not one of them has worked. They all suck 
but the lemon is great.
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Design for the this bearing is fairly knife-edge. You really need to refine the weight and dimensions very precisely for a design to work with it. C bearing stuff is more set and forget, so to speak.
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Yeah I 100% couldn’t adapt any of my c or d bearing designs to it
most designs I try end up either
- Losing power almost immediately
- Being wildly responsive even with immaculate clean bearings and pads recessed like 2 mm.
- Vibing to heck and back.
I initially got frustrated so I’ve kinda shelved the idea and just randomly when I get bored try again here and there.
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But anyway if you want to get an order of bearings talk to Jack at Zhangzhou Runstar Bearings. You can order and message through AliBaba. You will be looking at about $120 shipped before tariffs for 100 bearings.
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Probably won’t make this, and if I did, it probably wouldn’t work, but I threw this together after making a seat for an MR85. Made it really wonkily shaped
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How wide is it?
Decently wide. ~49mm wide with a standard 56mm diameter. Not at all optimized for the bearing size
At that diameter the throw won’t feel right and have kick back shin-hunting tendencies.
It’s also far too wide and wobble so much it will almost be hypnotic, although the generous centreweight will mitigate that somewhat.
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I’ve struggled even with standard width MR85 and plastic bearing seats, in large part because the inner race is so thin. Doesn’t take much for one side to press/cut into the plastic slightly and cause issues. Less issues with shields removed, but still issues. Usually they’ll be fine for a while, but after a few hours of play they start vibing or stop spinning as long.
I’ve had much better luck stepping down to MR84 which has thicker races and more space between the races (and a 3mm axle so that there’s still a bearing post).
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I may have asked this so please forgive me for the double question.
The copper and steal infused plastic, has anyone tried using that for just the bearing seat with any success on the MR85, with the denser material not being able to be cut into by the bearing?
And @MinerJ , whatever that clear plastic you have used in Nectars, it seems to really hold up well
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I exclusively use m3 hardware to give me more room for the same reason.
For printing test runs of the mr85 wide I switched to polycarbonate prints for strength so that the seat doesn’t fall apart, it reduced a lot of the vibe problems but the designs all still lose power crazy fast or are super responsive. Trickiest bearing to design for ever.
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The metal powder filament is actually weaker in bearing seats. I tried making bearing seats out of it and they always failed. That’s actually why the waffle stomper is split into two materials. The first prototype was all metal filled.
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Thank you for the follow up 
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Generally any filled filament is harder to print and harder to get fine details with. Such a thin seat would probably have more failures in a metal filled filament
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Not sure if this is too light, but I made a shutter inspired undersized design. 51g, 50.2mm diameter, 42mm wide
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That will work much better. 
Yes, it will be a bit too light though.
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Haha, I totally thought you just had it on loop for a minute there, killer!
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