Renkforce RF500 Maker Construction Kit - Page 62

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Push the extruder into the left opening of the extruder holder from
below(openingwherethequick-closureisinstalledatthetop).
The extruder must be aligned so that the side of the heating block
withtheheatingcartridgepointstotheleftoroutside(lowerarrowin
thegure).Theheatingblockmustruninparallelwiththefansheet.
Push the extruder entirely into the opening and tighten the threaded
pin.
Useeitheranangledhexagonsocketwrench2mm(totightenfrom
below) or a straight hexagon socket wrench that you can push through
the slit in of the belt tappet.