For pressfits the trick is not to rely on fab houses like scs to do them.. order parts with slightly undersize holes and use a drill press+reamers to bring them up. They can do finish work like that but it adds cost just like having them tap/chamfer etc. They may need to be over or udersize to work since bearings will vary a tiny bit by batch (plus ones like Igus has need undersize holes to preload them into tolerance) so best to do that part yourself and design accordingly. Drill press is useful if willing to buy the range of reamers you need. Pressing bearings in prints is easier cause you can adjust the printed holes till they work. I'll be posting my bearing findings for sure.
I'm using 5mm pitch/9mm width Powergate GT3 belts, starting with Gates branded ones to set the benchmark, will see if off brand ones compare. Using closed loop belt for now, might switch to open loop since the big pulley doesn't make a full rotation it can be fixed somewhere along the dia. You should be fine with 10mm HTD, the forces involved in these bases are low by their normal standards.
