Freeuniversal Battery pack holder (originally for 18650) Openscad tool to make any battery cell holder (with option to store, or build a battery pack)Thingiverse
FreeActiv8 a standalone touchscreen device that can be attached to and operate practically any 3D printer.Thingiverse
FreeOffset dual LED strip bar (made for Ender 3, but should work on any printer with a 20mm top crossbar)Thingiverse
FreeA simple Ender 3 spool holder; it will fit any printer with a similar 20x20mm top frame profile.Thingiverse
FreeAnti-vibration foot for 40X40 rail two grooves. For Creality Ender 3 and any other machine that has a frame with the same profiles.Thingiverse
FreeBFPTouch - Poor's man BLtouch. A simple, cheap, neat, precise, compact and reliable any surface Z Proble for bed leveling.Thingiverse