Introduction
Product Page
This Guide relates to this Prusa Mini Upgrade Kit:
https://www.bondtech.se/en/product/prusa...
Acknowledgements
This is a co-development work with Olof Ogland that came up with the initial idea and design.
Compatibility
The upgrade is compatible with the following machines:
Prusa Mini
You will need :
Parts
No parts specified.
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Select Filament.
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Select Unload Filament.
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Select the material you have loaded.
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The Prusa Mini will start by heating up the hotend.
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After reaching the desired temperature it will unload the filament.
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After unloading is finished, pull the filament out of the PTFE tube.
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Turn the Mini Off.
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Unplug the power cable.
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Cut the 3 zip-ties carefully.
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Remove the cut zip-ties from the Mini's feeder.
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Use the Prusa Mini's wrench to release the tightening pressure of the Bowden coupler.
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Finish unscrewing the coupler nut using your fingers.
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Detach the Bowden tube from the feeder.
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Use the 2.5 Hex to unscrew these 2 screws.
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Remove feeder and stepper motor from the mount.
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Use the 2.5 Hex key to release this screw.
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Remove the PTFE tube.
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Use the 2.5 Hex Key to untighten this screw.
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Use the 2.5 Hex Key to untighten these 3 screws.
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Use the 2.5 Hex Key to untighten this screw.
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Lift the top half to detach both feeder housing parts.
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Use the 2.5 Hex Key to untighten these 2 screws.
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Detach the stepper motor from the feeder housing.
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Use the 1.5 Hex Key to remove the setscrew.
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After removing the set screw raise the motor gear to remove it from the motor shaft.
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Use the Prusa Mini wrench to remove the PTFE coupler from the housing.
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Use the 1.5 Hex Key to push the feeder PTFE tube out of the housing.
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Stepper Motor
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PTFE Coupler male
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Spool PTFE tube.
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Feeder PTFE tube.
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Extruder; screws; zip-ties; motor gear and set screw; and thumb-screw.
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Insert the feeder PTFE tube inside the feeder.
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Screw the PTFE coupler in by hand.
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Finish threading the coupler in by hand.
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Use the Prusa Mini wrench to tighten it down.
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1x M3x3 mm set-screw;
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1x Motor gear
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1x Zip tie
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Insert the set-screw in the motor gear.
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Tighten the motor gear facing the set screw against the flat face of the motor shaft.
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Insert the 3 M3x35 screws through the back of the feeder.
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Orient the stepper motor so the cables are close to the cables groove on the feeder.
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Align the screws with the stepper motor and tighten them.
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The long and short screws go into each own respective hole.
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Align these 2 holes with the corresponding holes in the mount.
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Use the 2.5 Hex Key to tighten the screws and fix the feeder.
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Insert the bowden tube into the TPFE coupler.
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Start tightening the coupler nut by hand.
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Hold the coupler male with one wrench and finish tightening the coupler nut using the Prusa Mini wrench.
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Raise the X-axis by rotating manually the screw until the X-axis carriages touches the top.
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Move the print-head away from the feeder until it touches the X-axis far out extremity.
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Insert each of the 3 zip-ties through the feeder holes.
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Insert from this side.
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And push them through until they exit on the other.
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Re-sleeve the stepper motor cables...
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Until they reach the cables groove of the feeder...
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And then lock the zip ties.
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Use the cutting pliers to trim the zip ties.
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Make sure the zip tie lock is positioned furthest away from the Bondtech logo.
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Load filament into the extruder until it passes through the drive gears.
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Take the thumb screw and insert it in the hole of the hinge.
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Insert the spool PTFE tube up the push-fit on the feeder.
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go to LCD Menu, enter option Settings, scroll down to highlight HW Setup then long-press the knob. Similarly to the MK3S+, a new “Experimental” submenu will appear on the screen.
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Scroll down to "Z axis lengt":
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Adjust value to 190.
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Scroll down to "Extruder step":
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Adjust value to 415.
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Scroll down to "Extruder dir":
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Change value to "wrong".
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Find this screw in the cover of the electronics box and unscrew it.
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Remove the box lock.
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Hold the cable and tilt the box cover up.
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Move it slightly forward to release the 2 pin fittings on the bottom and remove the cover.
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Locate the extruder cable marked with a E yellow label.
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Locate the cable connector.
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Unplug the Extruder cable.
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With a hobby knife gently push the metal lock down.
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Remove the lead from the connector by pulling it in this direction.
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Perform the operation on the Blue and Red leads.
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Use the hobby knife to slightly raise the metal lock back to original position.
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Insert the Blue lead on the third position.
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Pull gently to check if it is locked.
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Use the hobby knife to slightly raise the metal lock back to original position.
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Insert the Red lead into the fourth position.
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Pull gently to check if it is locked.
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Re-locate the Extruder connector.
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And plug it in.
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Hold the cables away from the open box.
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Align the 2 pin fittings with the box.
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Tilt the cover down and fit the cable sleeves with the cover cuts.
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Place the Electronics Box lock back in place.
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Use the 2.5 Hex Key to screw it in place.
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