2B. Preparing the printer (MK3.5 Black PSU)

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Last updated a month ago

Difficulty

Moderate

Steps

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Step 1 Tools necessary for this chapter

⬢For the following steps, please prepare:

⬢Phillips screwdriver PH2

⬢2.5mm Allen key

⬢Needle-nose pliers (flush cutters) for cutting zip ties

⬢Piece of cloth or fabric (at least 15x15 cm) for covering the heatbed

Step 2 Preparing the printer

Before we start with partial disassembling of the printer, proceed with the following steps:

⬢Unload the filament from the extruder.

⬢Turn the printer off and unplug the power cable.

⬢Remove the steel sheet from the heatbed.

⬢Remove the USB flash disk.

⬢Take off the filament spool from the spool holder and remove the spool holder from the printer.

Step 3 Disconnecting the PSU cables

⬢Turn the printer so the PSU is facing you.

⬢Remove two M3x10 screws from the psu-cover using a 2.5mm Allen key. Remove the cover. Do not throw it away.

⬢Using a Phillips screwdriver, loosen four terminal screws but don't remove them completely and remove the power cables.

⬢Using a Phillips screwdriver, remove the screw holding the PE cable and remove the cable from the PSU. Leave the screw in the faston. Do not throw it away!

⬢By pressing the safety latch, remove the power panic cable from the PSU.

Step 4 Cutting off the zip-ties

⬢Carefully turn the printer, so the bottom side is facing you.

Cut the zip ties carefully, as there is a risk of damage to the cables.

⬢Using the flush cutters, cut the zip ties near the xBuddy board. Be careful not to cut the cables!

⬢Follow the cable bundle down. Cut three zip ties securing the cable bundle holding the cables.

Step 5 Removing the cable clips

⬢Pry out the upper cable clips using a 2.5mm Allen key.

⬢Pry out the lower cable clips using a 2.5mm Allen key.

⬢Gently remove all four cable clips from the cables.

Step 6 Releasing the PSU cables

⬢Take both power cables, the PSU PE cable and the power panic cable and carefully release the cables from the LCD cable loop.

⬢Place the cables behind the extrusion for better manipulating with the rest of the cables.

Step 7 Guiding the cables: parts preparation

⬢For the following steps, please prepare:

⬢Zip tie (3x)

Step 8 Guiding the cables

In the upcoming steps, please tighten all zip ties carefully, as you might pinch/break the cables.

⬢Locate the circular holes in the frame near the Z-axis right motor.

⬢Slide the zip tie through the circular holes in the frame to lock the motor cable.

⬢Tighten the zip tie. Be careful not to over-tighten the tie as it can cut the wires. Cut the remaining part.

Step 9 Guiding the cables

In the upcoming steps, please tighten all zip ties carefully, as you might pinch/break the cables.

⬢Continue upwards and using another zip tie secure the motor cable. Cut the remaining part.

⬢Insert the last zip tie and secure the Z-axis motor cable, the Y-axis motor cable and the xLCD PE cable.

⬢Tighten the zip tie. Be careful not to over-tighten the tie as it can cut the wires. Cut the remaining part.

⬢Good job! The bottom side of the printer is prepared.

Step 10 Placing the printer

⬢Place the printer back on its feet. Place the PSU cables next to the printer. We'll come back to them later.

Step 11 Releasing the PSU

⬢Loosen two screws holding the PSU on the aluminum extrusion using a 2.5mm Allen key. Do not remove them completely! Keep them in place.

⬢Remove two round head screws from the front side of the frame securing the PSU using a 2.5mm Allen key.

If one of the screws is hidden behind the X-end, manually rotate both threaded rods at the same time to move the X-axis up or down.

⬢Slightly lift the PSU until it can be completely released from the printer.

Step 12 Mounting the printer frame support: part preparation

⬢For the following steps, please prepare:

⬢Printer frame support (1x)

⬢M4x10r screw (2x) previously removed from the PSU

Step 13 Mounting the printer frame support

⬢Slide the printer frame support on the screws in the aluminum extrusions (instead of the PSU).

⬢Move the printer frame support to the frame.

⬢Secure the printer frame support to the frame with two M4x10r screws using a 2.5mm Allen key.

⬢Fully tighten the screws on the printer frame support using a 2.5mm Allen key.

Step 14 Covering the PSU cables: parts preparation

⬢For the following steps, please prepare:

There are two textile sleeves in your kit with different lengths and diameters.

⬢Textile sleeve 8 x 350 mm (1x)

⬢Zip tie (2x)

Step 15 PSU cables

⬢Place the single end of the PE cable (not the forked end) in the same position as it was removed. Secure the cable by re-using the screw and washer.

Note the correct orientation of the PE cable connector.

⬢In the following steps, connect the power cables one by one. The terminal screws are installed on the PSU already.
One has a prevailing red color = positive / +
One has a prevailing black color = negative / -

⬢Note that the polarity of the terminals on the PSU is:

⬢Positive (V+)

⬢Negative (-)

The red cable (positive) may have a black stripe on it. Similarly, the black cable (negative) can have a red stripe on it.

⬢Connect the power panic cable.