These are Knobs designed to fit in the two holes on the front of the doors from the Complete Replicator Front door by drandolph.

I printed mine at...

Object infill (%) 15 Layer Height (mm) .2 Number of shells 0 Feedrate (mm/s) 50 Travel Feedrate 30\

I do have Acceleration turned on.

They should press in to the holes without any modification. Then I used Weld On #16 to glue the parts to the acrylic windows. I just used a small amount on the lower lip.