A Closer Look - Outside
Out of the box, the Tower 100 looks very similar in design to the Tower 900, which is in turn a massive chassis. Thus, it is nice to see such a smaller, much more manageable unit. Overall, it does remind me of a 3D printer because of its three glass side panels and vented base.
Looking at the front, the glass is framed nicely, and clean with a TT logo on the shroud within. On the top cover, you will find two USB 3.0, a USB-C, and the usual audio connectors besides the power and reset buttons.
The rear is covered with the only panel made completely out of steel and has an opening for an ATX PSU on the bottom. Above that, Thermaltake has a magnetic metal-mesh-protected vent that comes equipped with a 120 mm fan. This is an interesting choice as it cools just the backside of the motherboard and thus has a limited impact on case thermals. Even with the fan, I would have loved to see a 140 mm variant instead.
Both sides of the Tower 100 come with panels that are made out of glass and metal mesh in one, which should really help with thermal performance, especially for any GPU.
In the top is a metal mesh cover you may pop off to reveal another 120 mm fan; this one is set to exhaust hot air out the top of the chassis. All the motherboard connections and GPU outputs will be accessible through here as well, with an opening in the rear of the top cover to route things cleanly.
On the underside are two separate dust filters you may remove for cleaning. A skinny one allows for air intake with long GPUs and a classic one for venting with the bottom-mounted PSU.