Fillament Spool Rewinder for Drybox - non destructive
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Helps easily retract filament back into "cereal" - drybox. No damage to the Container, almost fully 3D printable
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I got fed up with having to open my drybox just to rewind the filament back onto the spool to prevent tangles. I did not want to put any holes into the box so I decided on designing a top mounted solution. It uses a simple setup of bevel gears connecting a top mounted knob / rotator to turn rollers equipped with a foam strip for friction.
BONUS: It is almost completely 3D printable.
There is also an adapter included to turn the knob using a drill. Everything should print ready to press fit but if you still consider it to be too lose feel free to use a few drops of glue on the rollers and knob to hold everything in place. I would not recomend using glue anywhere else. Using some silicone grease will help everything work a little smoother if you notice any binding. If the bearings don't rotate freely you might have to shave off some material off the side printed on the bed. Since it hab Avery small tolerance any elephants foot can make the bottom fuse together.
The only other things you need is a piece of 10mm whide and 2mm thick self adhesive foam strip, some PTFE tube of your choice, and some (plastic) "Bowden Couplers" like these:
https://de.aliexpress.com/item/1005008047671379.html?spm=a2g0o.order_list.order_list_main.5.6ecc5c5fK6Pioc&gatewayAdapt=glo2deu
Assemble is pretty simple. Make sure you put the plug into the lid BEFORE installing the rollers/bottom axis, it can not be pulled out after assembly because the axis is too whide for the hole. One of the slip bearings goes in the lid, then the top gear is installed and the knob pushed onto the end. The other (hollow) gear is installed between the brackets on the lid. the two remaining slip bearings are installed into the brackets, the axis is then pushed through the bearings and the gear. Finally the rollers are pushed onto either end of the axis. Don't forget the foam strips on the rollers or the spool will not move at all.
It works great with the Drybox rollers by ValRC. Check out my remix in case you have issues with the rear axis slipping off its upports.
NO DRILLING NEEDED THOUGH!