Prusa XL spool holder tool for captive 3mm hex key
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Captures a 3mm hex key and self-aligns to ease working with the deeply recessed M4 screw in the Prusa XL spool holder.
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Single tool to ease working with the deeply recessed M4 screws in the Prusa XL side spool holders. Incoporates a captive 3mm hex key (must be at least 100mm long) which is inserted during a pause in the print.
When slicing, make sure you insert a pause while viewing the first layer that bridges above the tool cutout. This will pause the print at the right time, at which point you can insert the hex key. The small support piece will keep it from drooping and getting in the way of the print head, that can just be broken off and disposed once the print is done.
To use, put the hex key end in the spool holder, and the round guide should locate it so that it finds the hex head of the M4 screw, at which point you can use the handle to tighten or loosen the screw as necessary.
Note that the hex key in the photo has a ball end on the long leg of the L key. This isn't necessary as the tool should be held at the right angle, and if you have this and the key is long enough, you could cut that off with a Dremel or similar. However, the torques involved are fairly low so this should not represent a problem to leave it in place, as I did.