Replacing APC Smart-UPS SC450RM battery

How to replace the UPS battery without causing an outage.

Leveling the Průša Core One+ bed

A long and winding road to having an acceptable bed on my new 3d printer (Průša Core One+), despite a huge design / part flaw.

Swisscom 2025 security.txt challenge: full writeup

Brief and very complete writeup about how I procrastinated for a few hours.

Visualize those pesky rainbows (interactively)

A quick addendum to the previous post, an interactive rainbow visualizer.

On the unreasonable difficulty of plotting pretty rainbow, fast

When tasked with plotting the wavelengths of visible spectrum (aka rainbow), there's multiple options; most of them bad.