The a1 mini has a problem with the ptfe connector location unwinding filament when it starts a print causing tangles and I had a top cover that worked to solve this problem but wanted to have a handle to move the machine around so I remixed this model to have a spot to add the ptfe connector in a way that still lets the model be printed without supports. You'll have to take the connector from the side of your machine (or buy a second I suppose?) I just took the back cover off and carefully pushed the tab to tugged came off easy.