Most of the solder spool and sponge holders on here are for bare sponges, well I already have a nice metal sponge holder, so designed this to accommodate that and the huge 500g spool of leaded solder I just bought, and to ensure that it fit on top of my soldering station.

As you can see from all the rounding/fillets/chamfers, I made heavy use of the BOSL library for OpenSCAD, so Customizer won't work, but you can download the source and edit it that way if you want to add a spare tip or flux syringe holder or something.

Its specifically designed to be an easy print with no supports required.