Snug Fit Cap for 1/4 Quick Disconnect Air Fitting

A coworker of mine designed this to cover the quick disconnect fittings on his air tools. He stores his air tools with the fittings up so the idea is this would cover them from all the dust he makes in the shop. 

I 3D printed them for him and he gave me the ok to upload them here in case they might be useful to others. STEP file is included in case you want to make any changes