I do not have that many spare tips and wanted to use the tip compartment in the top insert for something else. So I created this insert which has a space in the cable compartment for one extra soldering tip.
Also check out my slightly modified top insert with space for 2 ESD tweezers instead of the spare tips: top_insert
The author remixed this model.
Updated the bottom insert to also have space for a tip holder in the cable compartment.