It's very easy to scratch the spine of your chair if you sit close to a wall. Or the wall.

This cap potentially protects both (if printed with a flexible resin) or the chair (if printed with a hard plastic).

JÄRVFJÄLLET office chair spine protection cap

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4316916.

Kite aerial photography picavet rig for YI 4K+

Kite aerial photography picavet rig for YI 4K+

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3490547.

Besides the printed parts you'll need:

 - [AstroSolar® Safety Film OD 5.0](https://www.baader-planetarium.com/en/solar-observation/astrosolar-safety-film-od-5.0-(20x29-100x50-117x117-cm).html) or it's alternative.
 - 58 mm screw-thread lens mount. I took my from a cheap replica of [Mennon DV-S 58](http://www.mennon-usa.com/products/mennon-dv-s-58-screw-mount-58mm-digital-video-camcorder-lens-hood-with-cap-black.html).
 - Three 4×6 mm bolts (or similar) with nuts.
 - Cyanoacrylate glue ("Super Glue").

Print the parts with a heat-resistant white plastic tolerant to UV light and sandpaper them. Cut the bolting holes to fit your bolts. Cut a ø 70 mm circle (60 mm  + 5 mm overlap) of the AstroSolar® Safety Film OD 5.0. Glue the film and one of the circle flange parts. Then glue the second flange part to the first so that the film is between two flanges. Cut the screw-threading part of the lens hood and sandpaper it too. Glue it to the triangle flange mount. Use bolts to connect the filter and the lens adapter together.

58mm solar filter for DSLR

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JÄRVFJÄLLET office chair spine protection cap

Kite aerial photography picavet rig for YI 4K+

58mm solar filter for DSLR