Hardware store didn't have the window screen roller, so I decided to design and print my own.

requires a 25 mm 3m bolt if you want to fit it with a nut, will probably work with a 20mm

made in onshape

[https://cad.onshape.com/documents/157b09a033238d13cb6f6862/w/6a3b67a55f0b48a17e542487/e/175176815c5db2381989d1bf](https://cad.onshape.com/documents/157b09a033238d13cb6f6862/w/6a3b67a55f0b48a17e542487/e/175176815c5db2381989d1bf)

prints fine without supports. no noticeable flexing at 20% infill