One of our sponsors had a Flashforge 3d printer they grabbed off Amazon when it was dirt cheap (around $700) and we borrowed it for a few meetings at the end of the season.
All of the red parts on the robot were 3d printed plus more you can't see.
We used them to print our own hex spacers and printed a ton of extras in 1/8" increments. Made later additions a breeze.
Instead of buying sprocket spacers for our wheels we just printed our own to save $4 a wheel x 16 wheels plus spares.
On the left we 3d printed a versaplanetary stage so we could offset the intake motor so we could mount our gearboxes the same but have enough clearance so when the intake rotated back we didn't risk it hitting an output shaft.
Other items we printed was a USB/Ethernet tether connector board that was really useful having one spot to plug in. We also printed some ultrasonic mounts that would snap on to the rings of our PVC but we never got them on the robot.
125 has used 3d printed parts for several years and had advocated that printing spacers is much easier and consistent compared to making them by hand. We agree!