One of the first things I printed when I recieved my Monoprice Maker Select V2 printer was a new spool holder. That's because the spool holder that comes with the printer isn't long enough to be used with any of the commonly available filament spools. At least not for the filament I've purchased. 

I think the Monoprice Maker Select Plus also ships with a spool holder that is too small.

Luckily, somebody on Thingiverse has a very nicely designed spool holder replacement for these Monoprice printers that attaches to the printer perfectly. This is one of the first things you need to print if you get a Monoprice Maker Select printer.