We have now modified our Mk4 bracket so that it clears the new Wi-Fi module on the Mk4s.

This further enhances the flexibility of the filament buffer, making it supprted on all versions of the Prusa Mk3 and Mk4 printers.

This new bracket clears the Wi-Fi unit on the Mk4S so the buffer is still mounted in its familiar position close to the printer, taking up as little room as possible.

facts about the RMU

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BF001: Completed printed buffer

We offer to produce and supply the complete RMU-Mk3. The total print time is nearly three days which some people may find onerous. The complete kit comes supplied with all the fittings pre-assembled so all you have to do is attach the top, base and the brackets and Teflon tubes.


You will receive all the component parts of the RMU-Mk3 plus a bill of materials, links to assembly instructions, tips and tricks and any other resources we think you might find useful.