I've had one of these anodized aluminum spider spacer kits for a while. They are OK but kind of spendy for what they do. They don't really fit my smaller diameter chucks like what I use on the rotary table or spin-dexer so I just 3D printed a graduated width set. In the slicer program I specify added wall face thickness so can take a skim cut to make them uniform width in case there is any print distortion. PLA machines quite nicely with a sharp cutter actually. The good thing is you can drill into them if the part requires without fretting about ruining the tooling.
