 The study reports the control of spontaneous emission from CD-Seth ZNS-Cauchel quantum dots coupled to novel open-access optical microcavities fabricated by focused ion beam milling, which substantially modify the quantum dot emission spectrum, spatial modes, and lifetime. An increase in emission rate of 75% is achieved at room temperature, attributed to the per-cell effect in the bad-emitter regime. The study demonstrates a high degree of control over the emission from the dots, including near single mode operation and the ability to detect strong emission from individual nanocrystals. This article was offered by CNDI, Hel N. V. Jones, Philip A. Dolan, and others.