Geeetech Mizar S 3D Printer

Printer maintenance

How to replace a hotend

Tools necessary for this guide
Wrench size 10 mm Allen keys – 1.5/2/2.5/3 mm Flat screwdriver tip width 2.5 mm Diagonal pliers Electrical tape Zip ties Craft knife or equivalent

Step 1 Preparing

Preheat the nozzle to 220 Celsius from the LCD menu, then unload the filament from the hotend.

Remove the Teflon tube from the hotend.

Before moving to step 2, remember to turn the printer off and unplug it from the socket!

Step 2 Disassembling the hotend

Remove the hotend housing and disconnect the hotend thermistor.

Release and remove the two screws that secure the hotend, then unplug all the cables on the extension board.

Remove the extension board and the part cooling fan.

Remove the strain gauge.

Step 3 Disconnecting the hotend cables

Remove the bottom cover and disconnect the cooling fan.

Disconnect the heater cartridge.

Cut off the heat-shrink tubing from the connection wire. Avoid cutting the cable.

Remove the old heater cartridge.

Step 4 Install the new hotend kit

Fix the new strain gauge.

Install the new hotend.

Run the cables of heater cartridge through the textile sleeve.

Insert the both heater cables into the connector.

Make sure the cables are fully inserted and tightened!

Tighten the textile sleeve with electrical tape.

Tighten the zip ties and cut the remaining parts.

Install the part cooling fan and extension board.

Connect all the hotend cables to the extension board.

Step 5 Install the PTFE tube

Take the razor or knife and carefully trim the tube. The Teflon ends should remain flat. Uneven ends may cause hotend to jam.

Insert and push the new PTFE tube into the heatbreak all the way down.

Install the print head housing.

Plug the cooling fan back in and secure the base cover with screws.

It's done! Plug in the printer and turn it on to check whether the printer works properly.

How to clean the hotend and replace a nozzle

Tools necessary for this guide
Tweezers for nozzle Wrench size 6/10/20 mm Cleaner rod (1.5mm diameter, 100mm length) Needle for nozzle Allen key - 2 mm

How to replace a control board

Tools necessary for this guide
Allen keys – 2.5/3 mm Flat screwdriver tip width 2.5 mm

How to replace PSU

Tools necessary for this guide
Allen keys - 2.5/3 mm Philips screwdriver for PSU cables

How to replace a hotbed

Tools necessary for this guide
Allen keys – 3 mm Flat screwdriver tip width 2.5 mm Diagonal pilers Zip ties

How to replace a screen

Tools necessary for this guide
Allen keys - 2.5/3 mm