3. X-axis assembly

Relevant for:

MK3S

Last updated 5 years ago

Difficulty

Easy

Steps

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Step 1 Tools necessary for this chapter

⬢2.5mm Allen key for M3 screws

⬢2mm Allen key for nut alignment

Step 2 X-axis: x-end idler and motor holder

⬢For the following steps, please prepare:

⬢X-end-motor (1x)

⬢X-end-idler (1x)

⬢Linear bearing (4x)

⬢M3x18 screw (2x)

⬢M3nN nyloc nut (1x)

⬢M3nS nut (1x)

⬢623h bearing with housing (1x)

Step 3 X-axis: inserting linear bearings

⬢Insert LM8UU linear bearings into the printed parts (X-end-motor and X-end-idler) as shown in the picture. Make sure the first bearing in each printed part is pushed all the way down.

DON'T TRY TO PUSH the bearings from the other side. There is a rim (smaller diameter of the hole).

⬢First pair of bearings should be in line with the top surface on both X-ends.

⬢Second pair of bearings should be seated on the rim (close to the lower surface) on both X-ends.

You can press the bearings against the flat surface for easier insertion.

Place two bearings in a way that the inner balls of the second bearing are rotated 45° compared to the first. This way you will achieve greater contact with the smooth rod. See the third picture for more details.

Step 4 X-end-motor: tensioner assembly

⬢Insert the square nut all the way in (deeper than in the picture) and then add the screw. For now, we need the screw just to hold in place. Tighten the screw, until its head almost reaches the surface of the printed part. We will adjust the final position later.

⬢Make sure the M3x18 screw is not visible in the marked hole as it will block other screw in future step. If you can see the screw in the hole now, please release it slightly.

Step 5 X-end-idler: bearing assembly

ATTENTION: be very careful during the tightening, check the nut orientation and DO NOT use excessive force, you can break this part.

⬢Insert the M3nN nyloc nut in the X-end-idler.

In case you can't press the nut in, don't use excessive force. Leave the nut for now and proceed with the other components for this step.

⬢Insert the 623h bearing into the X-end idler.

⬢Secure it in place using an M3x18 screw.

Now, if needed, use the M3 screw to pull the nut in.

⬢Place your finger on the bearing and ensure it can rotate freely. If needed adjust the screw.

Step 6 X-axis: smooth rods preassembly

⬢Take remaining smooth rods and compare their length. For X-axis you need longest rods (370 mm).

⬢Linear bearing (3x)

NOW, PLEASE BE VERY CAREFUL! Gently insert the rod straight into the bearings, do not apply too much force and do not tilt the rod!

In case you manage to push out balls from the bearings, please count them. One or two balls are ok, if there are more of them, please consider ordering new bearings.