This is made to hold the tamper for a 58mm portafilter and attach it to the honeycomb storage wall. This works with every tamper i have tried, including a mid grade one from amazon, the tamper that came with my Rocket, and my Pullman BigStep.
I printed this out of PLA with 4 walls and 30% infill to make it a little more sturdy, as tampers can be quite heavy. The little lip around the top makes it so that everything stays secure, but you can still see most of the tamper for aesthetics if you are into that sort of thing.
You will need a hexagon insert for the HSW to use this, it does not fit as printed. I like these as they give you a countersunk screw for mounting as well https://www.printables.com/model/453195-hsw-insert-82-deg-countersink-and-thru-hole-empty
I did take some inspiration from @Jojojo_426186, but i totally redid the design to only use on attachment point and made it fit a 58mm tamper. I used his work on the wall for holding my aeropress. Here is the link to his model for a 53mm tamp (check his profile for the aeropress files) https://www.printables.com/model/438208-coffee-tamper-holder-honeycomb
I also used this rubber mallet holder for my portafilters and it works great https://www.printables.com/model/446733-rubber-mallet-holder-for-honeycomb-storage-wall
The author marked this model as their own original creation.