if you make it a habit to clean out your machine yourself between every 2 bobbin changes and between projects you can avoid costly repairs & cleaning bills-
you can purchase a vacuum attachment kit that has all the tools you need to keep your machine running happily along-
the attachments connect to your vacuum hose- they are available at Clotilde's, Nancy's Notions, Keepsake quilting, Hobby Lobby, Connecting Threads and many computer stores- cost between $15 & $25---well worth it to not have to pay for someone else to clean your machine lint-
you should clean under the bobbin area at least every 2nd bobbin change (more often if using flannels or other linty fabrics) and between projects-check your machine manual to see if you should also be oiling your machine on a regular schedule- some machines need it (as often as every 8 hours of sewing time) some have (enclosed systems) and do not- but cleaning should be a regular maintenance task at least between projects.