Here's a video explaining how this spool holder works...https://www.youtube.com/watch?v=CmDmW-NRSjM&feature=youtu.bePrints entirely in one print, if you wantExtremely Stable with perfect dimensionsConnects and assembles brilliantlyRigorously designed to be as durable as possibleEngineered with the utmost mathematical rigorCompletely portable - works and supports wonderfully, without any issue, while PLA is printing from the spool... Easiest PLA color swaps to the extruder imaginable.*With various sized rods in the thing files, you can make this fit almost any spool... I've gotten it to fit on over 7 brands including Makerbot, Hatchbox, Gizmodorks, Ninjaflex, 3dxtech, prototype supply, etc... Pretty much every one...It's good to go... Every part prints in one print, it just takes a little alignment on the platform and a very leveled plate... This doesn't need more than 10% infill and can be printed well in 0.3mm...I have various sized rods that are labeled in the thing files... What you should do is measure your spool and see what sized rods you need to print to make it fit...Just choose 1 base arm, 1 spinner arm, and 3 equal length rods... Remember some spools have a small hole in the middle, and some have a big hole... If yours has a big hole, print a fat rod and two skinny rods, if yours has a small hole, print three skinny rods... I also have modified arms to fit the skinnier rods... be sure to check to make sure you downloaded the right files. When looking at the files, you'll see names like BottomRod_27in ... Here, and for all files that have a number and a number followed by "in"... like, 00in.... Put a "." in between... So BottomRod_27in is the bottom rod that is 2.7" long...