Elecom IST Static Bearing

I do not believe that these bearings are worth the $15 price tag plus $15 shipping from Elecom, so I designed and tested my own for a fraction of the cost. Do yourself a favor and build a significantly higher quality static bearing for under a dollar total. 

Included is a mounting block for a 3mm static bearing for use with the Elecom IST standard and Pro models. I recommend using ceramic and synthetic ruby bearings, but steel bearings will also work and are the cheapest and available option. However, steel may start to degrade after a few months due to corrosion from sweat. I recommend using a piece of leather or a softcover book to press the block down on to snap the bearing in, as something harder like a granite countertop could conceivably shatter with ceramic bearings (they are an extremely hard material).

I added a second (untested) STL with a 1mm center hole to hopefully allow you to pop the bearing out of if for some reason you wanted or needed to recycle it into another project. I'm gonna be honest though, if you grab a pack of 25-50 of these bearings for $6-8 you're only losing a few cents if you can't get it out. YMMV. The bearings are held pretty tightly.

Print recommendations:

• .25mm nozzle

• PETG, infill % doesn't really matter, but I havent tested higher than 20%

• 2-3 perimeters

Compatible with any of the Elecom trackballs with removable/swappable roller bearing:

• https://elecomusa.com/products/ist-pro-trackball-mouse

• https://elecomusa.com/products/ist-ergonomic-trackball-rollmaster

• https://elecomusa.com/products/huge-plus