Here are a couple handy washers for M3 and M4 bolts/hardware.
These have a nice snug fit and are very narrow to work in small places where you just need a little shim to keep things from rubbing.
We recommend printing a couple to make sure your printer is dialed in, then printing 20+ at a time and stocking your hardware bins so they're around when you need them (for example, when building the TuneFast Harp).
M3_Washer_v01.stl | 64.7KB | |
M4_Washer_v01.stl | 66.1KB |