Geeetech Mizar S 3D Printer

Printer maintenance

How to replace a hotend

Mizar S hotend kit is available in our website: Mizar S hotend kit

Watch video tutorial: How to replace the hotend of Mizar S

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

The nozzle for Mizar S is available in our website: 5pcs* Nozzle for Mizar S

Watch video tutorial: How to clean hotend and replace nozzle of Mizar S

Step 1 Clean the hotend

Preheat the nozzle to 220 Celsius from LCD menu.

Clean the surface of the nozzle with tweezers.

Unload the filament from the hotend.

Remove the Teflon tube from the hotend.

Use a cleaner rod (1.5 mm diameter, 100 mm length) to push it in and out several times, making the clog out. Do not use excessive force.

Use a needle to clean the nozzle.

Step 2 Replace a nozzle

Turn the printer off.

Remove the print head housing.

Release the old nozzle with a 6mm spanner while holding the heater block in place with a 20mm spanner.

Install the new nozzle and tighten it gently, but firmly. Do not use excessive force!

Place the silicone sock for heater block.

Install the print head housing.

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

How to replace a control board

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

The control board is available in our website: Mizar S control board

Watch video tutorial: How to replace the control board of Mizar S

Turn the printer off and unplug the power cable!

Remove the bottom cover, unplugging the cooling fan.

Disconnecting all the cables.

Replace with a new control board and tighten the screws securely.

Plug in all the connections as the picture below.

Insert the cables of power supply and hotbed. Red wire is positive and black wire is negative.

Make sure the cables are fully inserted and tightened!

Connect the LCD cable.

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 replace PSU

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

The power supply is available in our website: Mizar S power supply

Watch the video tutorial: How to replace the power supply of the Mizar S

Turn the printer off and unplug it from the socket.

Release and remove the two screws that secure the PSU.

Remove the bottom cover, unplugging the cooling fan.

Using a Philips screwdriver release all five screws.

Release and remove the two screws that holding the PSU and make sure you hold it before releasing the last screw.

Assembling the new PSU.

Ensure that the DIP switch of the power supply is adjusted to the right voltage!

Please triple-check you have connected the cables correctly!

There is a risk of damaging the PSU or the printer itself, if the cables are connected incorrectly or not tightened properly!

Tighten the two screws.

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

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

The hotbed is available in our website: Mizar S hotbed kit

Watch video tutorial: How to replace the hotbed of Mizar S

Turn the printer off and unplug it from the socket.

Remove the bottom cover, unplugging the cooling fan.

Disconnect the hotbed cable and hotbed thermistor.

Release and remove the three screws of the Y-axis rail.

Remove the hotbed from the printer.

Install the new hotbed kit and pay attention to how the Y-axis belt is installed as the pictures below.

Tighten the three screws.

Connect the hotbed thermistor and hotbed cable.

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

How to replace a screen

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

Turn the printer off and unplug the power cable.

Remove the bottom cover, unplugging the cooling fan.

Unplug the screen connector and put it to the side.

Release and remove four screws on screen.

Set the screws in place, tighten the screws.

Connect the LCD cable.

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