I love the design of the TUSH ultimate spool holder and I think it’s perfect for almost any printer the only issue I saw was I needed something to secure them together. I have also seen other makers solve this issue but all of them seem to require hardware or alter the stability of this great design. So my solution is very simple a SubFRame with no hardware and is a direct fit for most 1 kg spools. This design is very sleek simple and complements the original Spool holder.