To test the heatsink I used a RAMPS 1.4 clone board to manage the heatsink and the fan. The board is an MKS and runs a stock version of Marlin (only configured for the specific thermistor I'm using in the hotend):

Currently there's no attempt to build an actual 3d printer around this prototype (that'll come later). The goal is simply to heat and experiment with the hotend on my workbench.