Spool holder and roller system for those 4L cereal drybox. This is a multi height, yolk and cradle design for most sub 1kg spools of filament. it allows the spool to roll freely inside the drybox via the 608 bearings. Designed to use with 1/2" PVC pipe as the spool rod since PVC pipe is so cheap. I also included a simple file for a printed rod if a person chooses.

spools wider than 69-70mm won't work- spool rubs on container. I have had limited success with heatgun and reshaping the container to get another few mm out of it.

I used additional PTFE guide tubes for the filament which allows me to grab a box and load the filament into a printer without snags.The design allows room under the spool for dessicant. There is a endcap.stl file for the endcap which should be printed in flex filament

Parts needed:
(6) M3 x 5-8mm bolts
(6) embedment nuts M3 (3-7mm length, 4.6 mm dia)
(1) drybox
(2) 608 bearings 8x22x7mm
(1) x length of 1/2" PVC pipe (can be substituted for included file)
(2) M3 x 10+ mm bolts (optional if you choose to print the filament pass thru)
(2) M3 nut (optional if you choose to print the filament pass thru)

Instructions:
Mount the embedment nuts into the yolk. There will be 6 total. MAKE SURE TO MOUNT OR PUSH THROUGH EMBEDMENT NUTS ON THE SIDE WITH THE CHAMFER. See pictures

Mount bearings onto bearing holders (i use quick clamps to mount the bearings since the clamp pushes evenly and the bearings mount tight)

The "Y" part of the design is made for alignment purposes. This will GENTLY rest against the upper lip of the drybox during initial alignment.

Once you find the middle of the box front to back, score a line from top to bottom on the side of the box for reference. Place the yolk at the top of the box (lid off) and allow it to rest against the lip. (picture with red markings) Align the bottom hole with the mark you made previously and mark all 3 holes of the yolk on the drybox. Repeat on both sides. Drill out the 3 holes on each side for a total of 6 holes.

Mount yolk on the inside with the M3 screws. and make sure CHAMFER IS AGAINST DRYBOX WALL. (this is why the embedment nuts get pushed through from the chamfer side)

Use cradle inserts to adjust height of the spool. I typically need 2 per side.

PVC pipe- cut 65mm
Mount bearing holders into PVC pipe. These should be snug not tight.

***changes **
12/27/2020 added file endcap.stl