This page shows how to assemble Z axis Jaws
Often, this phenomenon can appear after a while whithout even knowing why or what we did.
There are always at least 1 or many reasons why this happens.
When we have this effect at the begining it can be time consuming or challenging to find out how to fix it.
A deposit 3d printer, is printing layers on top of the previous layers.
In a perfect world, all the layers are perfectly aligned and we have a perfect wall finish.
In reality, we can often have Z Wooble, it means that the layers are miss aligned and we have some « waves » on the sides of the prints.
If we look closely under light we can see a periodic pattern repeating itself.
If we look even closer we can see that the layers seems to be layered correctly but the height of each layer may vary slightly.
Le plastique s’écrase par moment et se détend à d’autres endroits.
If we place our threaded rod in front of a long print we can clearly see the pattern matching with the thread.
The identified causes so far are numerous, that’s why we can often accumulate them, making things challenging to fix.
Here are the causes we could identified so far:
Feel free to come back to us if you know some other causes and possible fixes.
Tighten the screw in order to clamp the fiber glass insulator and hold the thermistor in place.
Here is a view of the assembly once done.
Pictures under Creative Commons 3.0 licence
Source : http://wiki.e3d-online.com/wiki/E3D-v6_Assembly
Keep the big one for the side mounts.
Use the small ones for the base and top.
Here is a side view, the nuts must be aligned with the extrusion slot so that they can perfectly fit inside.
It can happen that 1 nut won’t turn properly because of various reasons. Be careful that it fully turns otherwise the lock performed buy the nut won’t be efficient.
So take a few seconds to make sure that each Nut has properly turned 90° inside the slot . When you unscrews the nut, it should perform another 90° angle counterclockwise and allow the whole system to be unmounted from the extrusion profile.
Notice the 40cm extrusion are placed on the sides and so that they are inside the chassis. Also the 60cm extrusions will respectively be placed on top and at the bottom of them. Now pre-assembled each of the 4 square holders with their set of screws + T-Nuts.
Screw each square holder on each corners
16cm will give you the proper place where to position the side mounts.
For this step, take the longer extrusion profile (70cm) that should be remaining and place it on top of the side mounts.Use a pair of square holders to fix it.
This should look like on the picture. Notice however that the top mount we present you are 2 x 50cm extrusion profiles attached by a center plastic mount. On your side you should have only 1x70cm aluminum extrusion
Start by preparing the 2 stepper motors.
You will have 2 symmetrical motor holders. One is for the right side, and the other one is the the left side.
Prepare M6x12 screws and their T-Nuts. Place them inside the 2 holes near the rounded corner of the part.
Take 4 M3x8mm screws and fix the motor and the support together.
Important Note: The motor support on the picture below is the Right motor support. The stepper motor with 1.2meter lead wire is to be screwed on this support.
In order to ease the assembly later on, make sure that the motor wires are places on the reinforced lateral side of the plastic part. It can also be placed on the same side as the M6X12 screws.
The wires are on the right for the right motor, and on the left for the left motor.
Here it’s the right motor with the 1.2 lead wire.
This pictures shows the 5mm side of the coupler
Do the same for the second threaded rod.
Note: The more recent Z axis smooth rods supports are very close to this picture.
The central guide for the Threaded rod has been removed because it deforms it leading to some bad quality prints.
Scalar M: Also take 1x 435mm smooth rod
Use a hammer to push it inside.
Slightly hit the plain side of the plastic part to keep it intact.
Scalar M: Push the smooth rod inside the plastic part until the length inside is about 1 finger index long minus 1 cm.
Scalar M: Now take the X axis previously assembled, and insert the threaded rod so the the top goes out of also 1 finger index long minus 1 cm.Now take the X axis previously assembled, and insert the threaded rod so the the top goes out of also 1 finger index long minus 1 cm.
WARNING: The LM8UU linear bearings are made with very small balls. If the smooth rod is not aligned with the bearing, and if you add force, the balls might get out of the bearing.
Start by the left side of the chassis.
Align the coupler with the threaded rod.
Take a hammer and hit the middle of the X axis Idler until the side of the mount is perfectly vertical.
If not, you need to unscrew the top screw and adjust the top position in order to align the bubble in the middle of the 2 lines.
Once both side aligned you should have something similar to the photo
|Front view of the assembled part||Back view of the assembled part|
|Scalar M: Pre assembled X carriage||Scalar XL: Pre assembled X axis|
Scalar M: Take the plastic part marked XMII and 2 x 435 long, 8mm diameters smooth rods
Scalar M: Push the rods inside the round slot on the plastic part of about 2.5cm .
Notice on the picture that the top of the plastic part is indeed at the bottom of the picture.
Scalar M: Once both smooth rods inside their slots, insert 2 x LM8UU bearings on the top rod and only 1 on the bottom rod.
You can figure out what is the top side easily. The marking is made so that when you read it on the proper side.
Pre assembled kit: Inside the pre assembled kit, the X carriage will already be mounted with the Linear bearings .You need to position it as shown on this picture.
Scalar M: Once the bearings are in place, take the other plastic part marked XMI 8 And push the available sides of the smooth rods inside.
This side should be easy to insert.
Here is the result if you have it right.
|Vue face||Vue arrière|
For some wiring consideration, make sure that the stepper motor wires are placed on the same side as the big hole on the side of the plastic part as shown on the picture.
If you have a magnetized screw diver, this will help you achieve that.
If not you can use the cylindrical imprints on each corners to slide the screws up to it’s final location.This should help you to screw everything together
This picture shows the front view of the support and you can see in the middle of the slot the screw coming toward us.
Place the tensioner at the middle of the front extrusion profile
Scalar M: 200mm from the side of the chassis
Scalar XL: 300mm from the side of the chassis.
(See the video link for more details)
Place the motor assembly on the opposite side of the chassis, at the middle of the extrusion profile.
Scalar M: 200mm from the side of the chassis
Scalar XL: 300mm from the side of the chassis.
(See the video link for more details)
The goal is to link the belt tensioner, the motor and the belt holder all together using the GT belt.
The video shows you how to use the belt stretcher.
Now consider your starting point to be the lower left corner of the wooden plate.
Scalar XL:Take a ruler and measure 105mm (10,5cm) from the bottom of the plate as shown on the picture.
Scalar M: Same operation but with 15mm (1.5cm)
(Scalar XL) 105mm / (Scalar M) 15mm
Do the same for the right side of the plate:
Place the belt holder plastic part in the middle of the plate. The back of the plastic part is to be placed on the right of the vertical line you traced on the center of the plate and just above the very last small vertical line you traced.
The picture should be very explicit.
Take a pen and make a mark at the location of each screw holes on the plastic parts.
Take one of the wood screw (you can take a bigger one to make it easier for your on this step). Point on each mark and give it a small hammer hit in order to create a starting point for the small wooden screws.
We advise you to insert only 3 screws by side in order to make it easier later when you will insert the smooth rods.
Here is an example of the left side of the plate with only 3 screws
In certain cases, the smooth rod is slightly tilted because the bearing support is not properly aligned.Here having only 3 screws will allow you to adjust easily
Scalar XL: 72,5mm
Scalar M: 40mm
In this corner you will place the smooth rod holder with the embedded end stop .
Place the supports inside the slots so that the top cable tie slots are always facing inside the chassis.
This 3D view is more up to date, and shows you where the smooth rods holder are located and also where the holder with the end stop is placed.
The picture shows you an example
here an example of a smooth rods that needs to be centered:
The main goal is to keep the smooth rods in place using cable ties.
Once the place is sliding fluently, you can tighten the smooth rods with the cable ties
Place the idler on the side of the main body, you will find a special hole to screw the idler on it.
Insert the M3X60mm screws with their washer and compression spring at the top of the main body. You should find 2 special holes where the screws can go. On the top you will also find 2 small slots, big enough to insert 2 M3 nuts. You will then need to screw the long screws inside those nuts to hold the whole system together.
Turn the main body and insert the plastic washer inside the round as shown on the picture. The washer is slightly tilted so that you can see it properly on the picture, but you must push it all the way inside the slot.
The 3rd screw has to be installed just near the bottom of the extruder, you should figure it easily.
Make sure to slightly tighten the wheel , because the wheel must always move freely without too much force on it, else the whole assembly will get stuck and your stepper motor won’t be able to push this wheel
You can then tighten the 2 M8 Nuts one against the other and help yourself with 2 hex keys
Now you can place the optional Nylstop nut (the nut with some plastic inside) to prevent any Nut from going out
Screw them inside the small holes at the very bottom of the main body. The goal here is to fix the plastic part on the bottom of the main body.
Notice however that one side of the plastic part is flat and the other one is not. make sure to insert it the proper side
Place it as showed in the picture, and insert 2 M4x30 screws.
On the opposite side you will find 2 M4 nut slots. Place 2 M4 nuts inside and screw everything together.
The picture here shows the metallic pneumatic connector in place
Insert a M3x20 screw + M3 washer and then close the whole system with a M3 nut.
On X Axis slightly space the linear bearings and move them on the center on the axis.
Also make sure the heads have at least 1 or 2cm of free length, this will makes things easier later on when you will tight them up.
The back view will give you more access to the cable ties and will make it easier to handle them.
Tight the cable ties so that the ties heads stay at the outside of the part.This will allows to have more free room for the belt later on.
Front view, the carriage looks like the picture.
Notice the cable ties that enroll the bearing.
Now take a stepper motor and 3 M3x20mm screws
The wires from the stepper motor needs to be oriented toward the machine .
Now , install the pulley on the motor axis. Place it as shown on the picture so that the thicker part of the pulley is facing the opposite of the motor. This will allow you to properly align the pulley’s teeth with the belt slot on the stepper motor support.
This side you should help you understand how to align the pulley with the belt slot.
Now take the belt stretcher that you assembled at the beginning of this chapter.
Scalar XL: Take also a M3x50 screw, a washer and a M3 nut.
Place the nut inside the belt stretcher, there is a dedicated slot on the side of it.
The washer will be mounted on the screw and will help to tighten the stretcher.
Use the tensioner support and place it at the end of the X axis smooth rods.It’s purpose is to make sure the tensioner will force on the X axis smooth rods ends and not on the Horizontal Z axis smooth rods.
She should be free and be fully inside.
Notice the triangular shape slot. The stretcher should be able to get inside properly.
The purpose here is to make sure the stretcher is in place and that we have the maximum amount of possible movement to stretch the belt later on.
Also take 2 cable ties
Insert the belt inside the slot of the stepper motor holder plastic part.
Insert it at the bottom of the bearings, the belt’s teeth facing the bearings.
On the other side, handle the belt so that it goes around the pulley.
With the belt’s teeth always facing the pulley.
Take care to push the belt on top of the bearings. The bearing will keep the belt straight to the X axis carriage so that when the motor pull or push the belt, it’s always rectilinear and parallel to the smooth rods.
Then pull the belt so that at least 10cm are available in the void.
Push it behind the X carriage.
Those 2 ends must be located at the top of the overall belt assembly.
If you have the proper length, the belt should slight cross with enough free belt.
Place it in the center of the X carriage
Take one end of your belt and push it inside the tight gap dedicated to keep the belt into position, between the 2 linear bearings.You might need to force a little bit so that the belt is slightly smashed between the plastic.
You can use your nails to push the belt up to the end of the slot.
At this moment try to pull the belt a maximum already so that it’s quite stretched .
Whatever you do, the belt will keep a small flexibility. It’s normal, the side stretcher will cope with that later on.
Now close the cable tie but make sure the belt stay aligned and parallel to the smooth rods. The belt must always be aligned at the top to keep the mechanical motion of the carriage linear.
You know that your belt is stretched when it seems very hard by pressing on it.
Considering the length of the belt, even when properly stretched, it might still seem a little bit flexible or might vibrate a little bit. It’s normal it shouldn’t bother that much the printing but might impact the maximum acceleration you can use on that axis.