08. LCD screen and PSU

Step 1

LCD preparation

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• Slide the lcd_support_a and lcd_support_b onto the LCD control board.
• Verify that the orientation is correct.
• Assemble the LCD cover on the LCD control board.
• Adjust the position of the lcd_support_a and lcd_support_b in order to insert the LCD control board on the cover.
• The LCD control board must clip into the LCD cover.
• Secure the LCD control board with 2x M3x10 screws (reused from your Original Prusa).
• Put the LCD knob back in place.

Step 2

LCD installation

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• Slide 2x t-nuts in the bottom front of your frame.
• Attach the LCD using 2x M5x10 screws.

Step 3

PSU upper mount preparation

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• We are going to test your dexterity in this step :)
• Prepare the following hardware:
• 2x M4x10 screws (reused from your Original Prusa).
• 2x psu_upper_mount.
• Place the M4x10 screw in the internal hole of the psu_upper_mount.
• If you struggle with this, you can insert a finger in the biggest hole (check the 3rd image). doing this makes it easier for you to hold and guide the screw into the hole.
• Insert the other M4x10 in the remaining psu_upper_mount.
• Now try not to lose the screws until we are bolting them on the PSU :D

Step 4

PSU type

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• The next steps are for the Prusa silver PSU only.
• If you have the Prusa black PSU, go to step 11
• If you don't know which PSU you have, please check the second image.
• Prusa black PSU
• Prusa silver PSU
• Image copyright: Prusa Research

Step 5

PSU upper mount assembly - Silver PSU

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• Attach the psu_upper_mounts to the silver PSU body. Fully tighten the M4 screws, ensuring that the PSU mounts are properly positioned and aligned .
• Verify that the psu_upper_mounts are aligned with the PSU

Step 6

PSU lower mount assembly - Silver PSU

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• The psu_lower_mount in this step is slightly different for MK2(S)/MK2.5(S) and MK3(S) but they have the same functionality and assembly.
• Take the psu_lower_mount and insert a square nut.
• Slide 1x t-nut into the lower channel of the rear extrusion, from the right side of the frame.
• Assemble the psu_lower_mount with 1x M5x10 screw. Don't tighten fully yet as it will need some repositioning.

Step 7

PSU installation - Silver PSU

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• Rotate the frame to the right side. Carefully guide the extruder to the right. Do not let it slide freely into the x-ends..
• Slide 2x t-nuts into the extrusion from the top of the frame, as shown.
• Position the PSU and secure it with 2x M5x10 screws. Do not tighten them fully yet.

Step 8

PSU installation - Silver PSU

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• Secure the bottom of the PSU with an M3 screw reused from your Original Prusa, do not tighten fully yet. This screw has a different length depending on which Prusa model you have:
• MK2(S) or MK2.5(S): length can be 18mm or 25mm (both are compatible with the psu_lower_mount).
• MK3(S): 10mm long.
• Verify that the PSU cables are not pinched and pass under the Y axis smooth rod.
• Adjust the PSU position to be flush with the extrusion at the rear of the frame.
• Fully tighten evenly, incrementally and in turn the screws of psu_lower_mount and psu_upper_mount.
• Verify that the PSU cables aren't pinched and pass under the Y axis smooth rod.

Step 9

Next chapter

⌕

• Congratulations you have finished this chapter :)
• Go to the next chapter: 09. Electronics assembly.

Step 10

PSU type

⌕

• The next steps are for the Prusa black PSU only.
• If you have the Prusa silver PSU, go to step 5
• If you don't know which PSU you have, please check the second image.
• Prusa black PSU
• Prusa silver PSU
• Image copyright: Prusa Research

Step 11

PSU upper mount assembly - Black PSU

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• Attach the psu_upper_mounts to the black PSU body. Fully tighten the M4 screws, ensuring that the PSU mounts are properly positioned and aligned .
• Verify that the psu_upper_mounts are aligned with the PSU

Step 12

PSU lower mount assembly - Black PSU

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• Take the psu_lower_mount and insert a square nut.
• Slide 1x t-nut into the top channel of the rear extrusion, from the right side of the frame.
• Assemble the psu_lower_mount with 1x M5x10 screw. Don't tighten fully yet as it will need some repositioning.

Step 13

PSU installation - Black PSU

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• Rotate the frame to the right side. Carefully guide the extruder to the right. Do not let it slide freely into the x-ends..
• Slide 2x t-nuts into the extrusion from the top of the frame, as shown.
• Position the PSU and secure it with 2x M5x10 screws. Do not tighten them fully yet.

Step 14

PSU installation - Black PSU

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• Remove the PSU cover (with Prusa logo) by unscrewing the 2x M3x10 screws.
• Take an extra M3x10 (reused from your Original Prusa) screw and secure the PSU to the psu_lower_mount. Do not tighten fully yet.
• Verify that the PSU cables are not pinched and that they go out of the back of the PSU and pass under the Y axis smooth rod.
• Verify that the PSU cables are not pinched and are routed correctly.

Step 15

PSU installation - Black PSU

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• Adjust the PSU position to be flush with the extrusion at the rear of the frame.
• Fully tighten evenly, incrementally and in turn the screws of psu_lower_mount and psu_upper_mount.
• Reassemble the PSU cover with 2x M3x10 screws (reused from your Original Prusa).
• Verify again that PSU cables aren't pinched and are correctly routed.

Step 16

Next chapter

⌕

• Congratulations you have finished this chapter :)
• Go to the next chapter: 09. Electronics assembly.