Prusa MK3 Full Assembly - Frame and Y-Axis (Timestamps in Description)

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Timestamps from the prusa manual: The Y-axis

Step 1 Tools necessary for this chapter No timestamp available
Step 2 YZ frame - preparing the components No timestamp available
Step 3 YZ frame - mounting the longer extrusions 08:55
Step 4 YZ frame - mounting the shorter extrusions 05:20
Step 5 YZ frame - final check No timestamp available
Step 6 Y-axis: front and rear plate preparation No timestamp available
Step 7 Y-axis: front plate assembly 13:47
Step 8 Y-axis: preparation for PSU 11:33
Step 9 Y-axis: rear plate assembly 11:56
Step 10 Y-axis: geometry check 14:51
Step 11 Mounting antivibration feet (optional) 17:07
Step 12 Y-axis: front and back holder No timestamp available
Step 13 Preparing Y-holder-front and back 18:09
Step 14 Mounting the Y-holder-front and back 19:45
Step 15 Preparing Y-belt-idler (part 1) 22:49
Step 16 Preparing Y-belt-idler (part 2) 23:29
Step 17 Preparing Y-belt-idler (part 3) 23:29
Step 18 Mounting the Y-belt-idler 26:00
Step 19 Y-axis: motor and motor holder 27:50
Step 20 Preparing Y-motor-holder 29:03
Step 21 Mounting Y-motor-holder 30:29
Step 22 Y-axis: Y-carriage No timestamp available
Step 23 Correct bearing orientation No timestamp available
Step 24 Installing bearings on the Y-carriage (part 1) 32:49
Step 25 Installing bearings on the Y-carriage (part 2) 32:49
Step 26 Assembling the Y-belt-holder 37:46
Step 27 Inserting smooth rods into Y-carriage 39:30
Step 28 Mounting the Y-carriage 40:44
Step 29 Securing the Y-carriage 41:32
Step 30 Aligning the smooth rods 46:27
Step 31 Assembling the Y-motor pulley 43:23
Step 32 Y-axis: Assembling the belt (part 1) 43:49
Step 33 Y-axis: Assembling the belt (part 2) 43:49
Step 34 Y-axis: Assembling the belt (part 3) 43:49
Step 35 Aligning the Y-axis belt 45:13
Step 36 Tensioning the Y-axis belt 45:53
Step 37 Testing the Y-axis belt No timestamp available
Step 38 Y-axis is finished! 47:15

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[FX]

Just completed this step last night. I was ULTRA careful about tightening the U-bolts, so I assumed sliding the rods into the bearings would sound like a well lubricated trombone (virtually silent and effortless to slide). But not so, there is definitely a “drag” and you can hear the bearings rolling quite loud. It was even a bit sandy sounding, so I put some of the prusalube in bearings and lightly coated the rods. The good news is once I popped the rods into the y-holders and secured everything the carriage moved considerably smoother and no more sandy sound. However, the bearings are still quite loud and it takes a bit more than a finger-flick to move. It stops moving almost instantaneously after I stop applying force. From all these comments it sounds like I did okay. Everything is level and carriage is secured tightly by the u-bolts. One thing to note is I had better results by making SURE the u-bolt protruded in equal amounts out of both nuts through which they are fastened.

[HaeonWVZ]

Thank you for this! I'm preparing for my MK3S+ build next week and have been very nervous about a few key points in the process, your build videos have really put my mind at ease. Cheers!

[arelectronics]

At last found a best assembling video ever

[gastondombiak]

Thanks for sharing your video. It is very well done with good zoom-ins and comments. You make it look like it is very simple. Was there no need to add grease or oil to the rods and bearings?

[TimothyScotts]

Hey Stef! Thanks for the awesome videos!

I purchased the kit version a couple of days ago and I am really excited for it! How has yours held up? are you still happy with the finished result? I was thinking of cleaning the linear bearings in some Isopropyl alchohol and then repacking them with some Super lube synthetic grease, do you think there is much value in me doing that?

keen to hear your thoughts :D