Due to shipping costs, we are only doing Local Pickup and Direct Ship for Prusa Enclosures at this time.  Direct Ship is for Prusa to ship the enclosure directly to you, otherwise you're paying for shipping twice, plus more of our time to receive and ship the printer.
 
Educational Institution or Non-Profit that can't order direct from Prusa?  Inquire for special pricing and shipping options.
 
Introducing Original Prusa Enclosure: Modular box for your 3D printer.
Enclosures mainly help with stabilizing the inner environment and raising ambient temperatures, which is vital for printing materials such as ASA, PC-CF, PP, and others that have a tendency to warp. 
 
Original Prusa Enclosure is an accessory for your 3D printer that houses your Original Prusa i3 MK3S+ or MK4 and provides a stable printing environment. The Enclosure helps to reduce odors from certain materials, lowers noise, can be equipped with useful addons for increased safety and/or the possibility to run the printer in public spaces and helps with printing advanced materials due to the passive heat coming from the heatbed (prevents warping). There is enough headroom above the printer inside the enclosure to mount the MMU2S unit.

Everything is included in the package including plastic parts, you don’t need to print anything on your own. The only exception are the handles (seen in some photos) – these are optional and not included in the package because most users won’t need to move the enclosure around, and the silver PSU retainer . Assembly instructions are avalible online. A 3D printer is not a part of the package.
 
For all the details, check out Prusa's page here