Very simple Half-Life inspired phone holder. It resembles Half-Life Lambda logo with minor tweaks to make sure your phone can sit comfortably on it.

It's a very simple print so you can slice the model yourself just the way you like it.

I printed mine with Black and Red PETG (would look even better with Black and Orange) using 0.4mm nozzle, with 0.2mm layer height. Also I added two color changes so that top and bottom faces are different color from the main part. It looks great and fits my phone great. You can also scale and flip/mirror the model to get the perfect fit and look for your phone holder.