(Almost) Universal Spool Weight for QidiBox MMU Unit

An easy to print container for lead pellets that is easily sealed with a single M6 BHCS.  When filled with 2mm diameter lead pellets this will weigh in the order of 826g, but final weights will vary depending upon what weight material is used.  Allows for weight pellets up to 5.0mm in diameter.

This model is flanged and works with most cardboard and plastic spools.  It is inserted into the central hole of the spool and the flange prevents it from falling out, and its width is such that it will remain centrally located in all regular spools that will fit within the QidiBox

Required additional parts

This model needs:

• 1 of M6 x 6mm SHCS bolt which self-taps into the plastic to seal weight material into the cavity
• Ball bearings, lead shot, or iron filings that can be used to fill the cavity to add weight

Printing Recommendations

Print in any material that can stand 70C temperatures or higher

Best if printed with 100% infill, and a 0.2mm layer height

Also Print the fill-funnel model to assist with inserting pellets/material during the assembly phase.

Assembly Instructions
 

Fill container with lead pellets no larger than 5mm in diameter.
A good example is this: https://a.co/d/cMbEnDu
Also consider iron filings, loose steel bearing balls, BB's, or similar

Use a M6x6mm Button Head Cap Screw (BHCS) to seal the container.  This screw will self-tap into the plastic.  The hole is tapered and sized to provide a secure and tight fit for the screw,

Place the weight into the spool cavity as shown.  This will prevent the spool from skipping in the MMU unit when low on filament.

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