The one in the pictures is the: "Force Workshop bike pump holder d2 draft" where the whole Surface sits with an angle inward to keep the holder from sliding off. Additionally I have used a small Ø 10 mm glued on rubber pad on the end (the kind you use on the feet of chairs).
Designed for Ø4 mm screws (I have painted the head of the screw black to fit with the bracket).
I printed mine in PETG with 0,8 mm nozzle and 0,55 mm layer height.
The author marked this model as their own original creation.