Articles on: Hardware Maintenance

Replacing the Galileo O&P's Hotend

With the Printer's toolhead needing to have parts replaced, use the following guide to do so.


Tools Needed:


  • Any Protosthetics Provided Materials
  • 2.5mm Hex Key
  • 2mm Hex Key
  • A Long and Thin Philips Head Screwdriver
  • 2 Zip-Ties (should be Protosthetics provided)


Ensure the filament is unloaded and the nozzle is cooled down before following this guide. Failure to do so will result in damage to the extruder, and burns due to a hot hotend.


Replacing the Hotend


  1. Wait for the toolhead to cooldown, then turn the printer off by pressing the power button icon in the bottom left of the main screen > shutdown:

  1. Start by unscrewing the screws on the front of the toolhead (extruder and fan), and the one screw from the left and right sides of the toolhead
Use the 2.5mm Hex Key - Your toolhead may not have all of these screws present. Remove any present screws and remember which screws you have, they'll be necessary for re-assembly later


  1. Lift the extruder out and look inside the void where the extruder was. Afterwards, undo the 2 Screws in the void itself: Feel free to remove the plastic feeding tube at this time.
Use the 2.5mm Hex Key


  1. After removing those two screws, the void will pull straight up and off the toolhead. Then, undo the 4 Hex screws holding the Hotend in place: If you haven't already, remove the Plastic tubing at this time, as its no longer present in the picture: Use a 2mm Hex Key
ONLY REMOVE THE SCREWS CIRCLED IN RED. Removing the screws behind them will cause the belt tension to break, requiring a different guide to retention it.



  1. Remove the rubber shield from the nozzle, it will pull straight down very easily with your fingers. Do Not pull from the silver part on the bottom of the nozzle. The Rubber shield will pull down without much resistance. The hotend will remain in place during this step, and will be removed during a later step.


  1. Remove the Frame holding the wires on the back of the toolhead. It is a little difficult to see the Philips Head Screws: Utilize the Philips Head screwdriver



  1. You'll need to cut the 2 zip ties to help remove the hotend. Note how they are secured as you'll need to secure them again later. Then the hotend will pull straight down from the chassis with a little to medium difficulty.
Be careful to only cut the zip tie, not the wires. You may use the micro cutters that come with the printer to do so. Cutting the wires will count as negligence towards the printer and will incur repair fees depending on the wires cut.



  1. Follow the cables from the old hotend to the exposed cables on the back of the toolhead. Then you'll unplug the current hotend from the White and Black cables as shown in the picture below.
The White Cable goes with the Blue CableThe Black Cable goes with the Red Cable




  1. With the new hotend plugged into the connected cabling, you'll need to rethread the Zip-Ties where they were cut from Step 7. Do so now, but Do Not tighten them down.
  2. Wrap the Cabling around the toolhead as was noted before from Step 7, then insert the hotend into the bottom of the toolhead chassis like it was in Step 4 and 5. Screw those 4 silver screws from before back in.

  1. With the Hotend secured, insert that plastic feeding tube back into the toolhead in that center hole from Step 10. Then secure then tighten the zip ties from Step 9, preventing the cables from moving during the reassembly and printing process.
  2. Reattach the rubber shield onto the hotend from Step 6, then reattach the Extruder void that was removed during Step 3.
  3. Reinsert the Extruder as it was removed in step 2, reattaching all removed screws as they were noted.
  4. Plug the printer back in and load filament/start your next print.
Let the Protosthetics team know if you have any questions along the way.


Job's Done

Updated on: 29/01/2026

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