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MK4S to CORE One+ Conversion kit - Old xLCD version

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In early 2026, we discontinued the sale of MK4S to Prusa CORE One+ Conversion kit, compatible with the old version of xLCD. 

This affects exclusively conversion kits for printers with an old version of the xLCD, printers with a new version of the xLCD have a fully compatible conversion kit. 

Below is how to compare the xLCD versions, and how to proceed in case you wish to upgrade to CORE One+, but have the old version of xLCD, without having to replace the whole xLCD. 

Comparison of new vs old xLCD versions installed on the MK4S.

Looking at the rear of the disassembled xLCD. New version, also referred to as Version A, has the grounding point located on the top left hole.Looking at the rear of the disassembled xLCD. Old version, also referred to as Version B, has the grounding connection (PE / FE) on the bottom-right.

I have the new xLCD version

The MK4S to Prusa CORE One+ Conversion kit already includes all necessary parts. In our assembly guide, refer to Version A of the xLCD.

I have the old xLCD version

The MK4S to Prusa CORE One+ Conversion kit includes all necessary parts, except for the xLCD Cover. The rear cover (xLCD Display-mount) is universal for all versions and included.

In addition to the included parts, it is necessary to print the front cover. The file is available on the dedicated Printables page for CORE One/+ printable parts. From the files tab, scroll down to Model files, open the Trim, Door & xLCD folder.

The printable part is xLCD COVER R2.

Alternatively, the xLCD Cover can be taken from the old MK4S and used on the printer converted to CORE One. Since the xLCD doesn't change, the existing old cover is physically compatible, but it has an MK4S marking on it. 

In our assembly guide, refer to Version B of the xLCD. 

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