37mm flat version of the Filler Hold Guide by HugoHuge
thingiverse
As I've modified some spools with a smaller inner diameter to fit the original Hold Guide, I've adjusted its total height down to just 37mm. With an infill of 50-60%, this setup should be stable enough for 1kg spools. If you require even more stability, consider investing in a long nail and building a hole for it to insert into the guide's base.
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