HookJab's design is great, but I use my pinecil on the go frequently so it lives in it's travel case but I use the heatset inserts less frequently and rarely away from my work station. I remixed the design to make it more compact, and also there was enough room to allow for one of the mid sized tips to stay installed if you frequently use one size. In my case I almost always use M3 so that practically lives on the heater.
The author remixed this model.
This removes the pinecil storage, leaving only room for the heater and the tips, shrinking the size down by 2/5 and leaves room for some of the tips to stay installed. if you use them frequently.