I think that this design is nice and I printed one, but it is too under constrained for me to trust it to print stuff without me there. it is a bit wonky and needs to be constrained top and bottom. I do like many of the features of it and it is a great idea, it just needs some work. I will eventually remix the design and I look forward to the original designers reviews/ideas/comments. The features I will keep are the use of gravity to hold it in place. The things I will change is I will attach the two uprights to each other and make them and the filament spool to be a single rigid assembly. Thank you.