Hate paying for something so simple so took 20 minutes to design this. Costs about $1-$1.50 to print depending on infill and your filament costs. Free access to anyone who wants it.
https://www.makeronline.com/en/mode... re-circulator/332978.html?trackModuleType=10
https://www.makeronline.com/en/mode... re-circulator/332978.html?trackModuleType=10
