This is a cool design of coat rack to hang the keychains. You can fix it to the wall either using the M3 bold through the middle holes or you can directly hang it to the something fixed on the wall through the top holes. You can also fix it with the double-sided tape through the space behind of the part. 
%100 infill is recommended for higher strength.
Please let me know in the comments about the design. 

Coat Rack for Keychains

Coat_rack.STL

This is a very simple door number. You can download as free!
Infill: Does not matter
Filament: ABG PLA (Red)

Let me know in the comments for uptade.

Short of door number and number 14

number_14.SLDPRT

Profession: Space Engineering
Ham Radio Operator (TA6AGB)

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Coat Rack for Keychains

Short of door number and number 14