I’d be happy to print some (and buy the most suitable engineering filament) if we can collectively come up with a design that we want to see.
It seems that the commercial ones are probably injection moulded ABS.
I sadly don’t have a Handle Saddle to mount it onto though, and my mesh modelling stills are certainly mediocre at best (such a saddle would be moderately complex to model parametrically).
I don’t know whether that’s a particularly good idea, but if it fails less often than Quax’s Qaxle bearings, I’d call it a win. Thoughts?
edit: @Eric_aus_Chemnitz also spotted a bearing dimension even closer, 25x42x9, though there it’s the inner not the outer diameter that needs a shim plus another shim for the width. Sounds better, doesn’t it?
As Qu-Ax’s frames (mostly) have the bolt positions offset from the bearing centre, as much as that 7mm bearing seems narrow, it would probably put them in about the right position.
It’s probably not a good idea in plastic, although in aluminium like the KH bearing adapters that you can buy/used to be able to buy it might not be so bad.
Maybe. The inner shim is probably easy-ish to make, from some 0.5mm sheet stock, and then the spacer can be pretty much whatever you like so long as it’s non-compressible - 3D printing a solid part would be fine here. Again the offset of the bearing should be no problem with the Qu-Ax frames.
It seems HDPE typically has poor layer adhesion and issues with warp, so although I can almost certainly print it (I’ve 3D printed POM, and pure PC with reasonable success), for something quite slim, large, and moderately complex it certainly wouldn’t be easy, and a single iffy layer would cause the whole part to be scrap.
Sadly the ones I had 3D printed seemed to break quite easily, they don’t appear to like backwards UPDs.
Anyway, I took a broken one to a local CNC company (and emailed them your CAD file) and they’re making six for me from aluminium.
I don’t have them yet, but they’ve just sent me this pic of the first two, and they look fantastic.