A FB poster was asking if these existed, so I made them.. Stops all the gunk falling into the V-Slot rail on the Ender-3... (and maybe loads of others too!)
The fillers are 140mm long, and should slip under the Z rail no problem.. Just don't push too far, as they are a sod to get back out!
140mm_TeeBar_Slot_Filler_v1.stl | 7.5KB |