TrueVIS SG-300 30" Printer/Cutter
I would like more information about maintaining the TrueVIS printers and what consumables need replacing
Answer
Maintaining your printer is key to optimizing the TrueVIS print quality. Even though you perform a manual cleaning once a week there is a time where you need to replace a few consumables.
Watch this video on how to maintain your VG & SG series printer.
VG & SG Series Replacing Consumables
Roland also offers a written step by step document on maintaining your VG & SG series printer. 
Manual Cleaning Guide for Roland TRUVIS Printers
TrueVIS Printer maintenance checklist
VG SG TrueVIS Series - Maintenance Checklist
Models: VG-640, VG-540, SG-540 & SG-300
Roland TrueVIS based printers will require preventive maintenance practices to ensure the highest quality of performance and adhere to original equipment warranty. The checklist below describes specific components that come in contact with TrueVIS inks. These parts need to be cleaned on a regular basis and should be replaced according to the schedule due to normal wear. It is essential to adhere to the suggested timeframes for maintenance and replacement to avoid needless downtime that might require a service visit from your supporting dealership. The TrueVIS printer will prompt the operator to perform manual maintenance once a week.
VG & SG Series Printer Maintenance Checklist
How can I purchase replacement consumables?
Please contact your Roland authorized Dealer to order the parts. Or they can be purchased on the Roland DGA Store. Click on links:
Swabs only (50 pieces)
Pad Cleaner
VG wiper blade
Pinch Rollers(L/R)
Tweezers
Cutter Protection Strips (Cutter Pad) by Model (click on link by model)
VG-540 (Same Part NUmber for VG-540A)
VG-640 (Same part number for VG-640A)