FYSETC CORE eMK4S Upgraded Kit The first 10 customers to place an order will receive a free MMU3 set (prinparts not included). First, a huge thank you to Juan Puchol for his idea. This is an upgrade kit for upgrading the Prusa MK4 to a corexy structure. This significantly increases the print area and can meet your printing needs. However, please note that due to R&D needs, this is a pre-sale link. Please note that we will only produce the product once we receive a certain amount of order demand; otherwise, we will cancel the project. Thank you for your understanding. Shipping Time: For customers in the EU, we will ship from our overseas warehouse, and the waiting time is 40 days (from China to our overseas warehouse). For customers in the US, we will also ship from our overseas warehouse, and the waiting time is approximately 30 days. Customers in other countries, please contact customer service for shipping details. Method For more information and BOM: https://www.printables.com/model/1432021-core-emk4s?fbclid=IwY2xjawNldLlleHRuA2FlbQIxMABicmlkETFXVW0zb2U5S0gza1VNWklSAR5FHVUHMPZ5yWkw6_JhGM5MD-LmBfG4O-pImE6Wb1X5A3c7J_BqBZiofIU-Ig_aem_SyMJiJ6NF8d5WR82jSwxHg