Hi. All of a sudden wrinkled down the middle. This is the first treadmill we've owned. Is this one of the ways to tell the belt needs to be replaced? I figured it'd be more of tread wear, but obviously don't know. Thx

[color=#1d2129]Any advice or suggestion concerning a desktop air purifier? I do 3D printing using ABS in an enclosed room. Although I don't do continuous printing and I do open the window, weather permitting I can't escape the ABS fumes. Fortunately my printer is enclosed and does a pretty good job of isolating the fumes. But they must go someplace and I assume eventually in the surrounding air. I have selected a couple possible purifiers for an area of about 100 sq feet. Question is, can these air purifiers handle ABS fumes? One of the units boost..."100% OZONE FREE, we NEVER use UV-C light or anion purification that cause or aggravate health problems." Would an ION booster or UV be of any benefit? These units are [/color][color=#111111]ETL listed, FCC certified, and CARB approved and can tackle particles down to 0.3 microns .[/color] [color=#1d2129]I have another 3D printer on order and I don't believe it comes with an enclosure, but I plane on installing one. BTW...I need to keep the cost below the $100 level. Suggestions welcome.[/color]