$18 Printrbot Simple Metal Heatbed Upgrade

For a while now, I've been wanting to upgrade my Printrbot Simple Metal with a heated bed. I've been hesitant to buy Printrbot's official upgrade kit, due to the $125 price tag. I ended up buying [this $18 (including shipping) heater](https://www.aliexpress.com/item/150-150MM-12V-160W-Silicone-Heater-Bed/1879687027.html), and sticking it to the bottom of the printer's bed. [Here](https://imgur.com/a/0YVxa) are some pictures of it. The basic steps I followed to hook it up are below: