Cereal Dry Box Bin Stretcher

I made this model because the 4L cereal boxes I was using to print TPU didn't fit a Bambu spool. The spool would rub against the sides of the cereal box where it was indented. So I made this model to stretch the cereal box. If the polypropelene box is heated while being stretched, it will deform. Once it cools it stays stretched and then the larger spools will spin freely in the box. 

When assembling the parts, note the “left” and “right” marked on each side. The screws also have a “R” and an “L” marked on the ends. The “R” side screws into the “right" side, with normal righthand screws. The “L” side screws into the “left" side with left hand screws. I recommend inserting each screw just far enough to stay in to one side, then pressing the other side against the screws. Tighten each screw a quarter turn at a time so that they tighten together evenly. Pay close attention that each screw is grabbing both sides, you may need to back one up and try again to get it to catch the other side. You don't need to tighten it all the way, about ¾ of the way should be enough to start. 

Here is a video on how to use it:

Here are the cereal boxes: https://www.amazon.com/dp/B07HRKJYJF?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1

Here is the 3D model for the bearings: https://makerworld.com/en/models/39426-dyna-dry-box-filament-box-4l?from=search#profileId-38635