Cause analysis:

1.material is exhausted

2.material is entangled

Some materials are not rolled well in the production process , or did not fix the end of the wire after use, leading the wire knotting in the printing, so material can not extrude smoothly through the nozzle.

3.material heating temperature is not correct

Different materials have different heating temperature , if you use a higher temperature printing material, such as ABS, but you set low temperature, then it will lead the material extruding not smoothly.

4.nozzle is plugged

The plug is one of the most common FDM printing problem, the impurities contained in the material are likely to cause the plug.

5.Teflon (PTFE) deformation

Teflon tube in the throat will become soft in high temperature environment for a long time, so it can be deformed easily,so it may hinder the movement of material and can not insulate heat for material.

6.cooling fan for the throat is bad

If the cooling fan for the throat is bad, material will expand in the throat, resulting in throat plugging.

7.poor material quality and improper storage of materials

material diameter deviation is very large by some manufacturers and material would be brittle, very easy to break after long time exposure to absorb moisture in the air. Therefore, materials should be stored in dry sealed environment.

8.feeding motor lack of phase

When the feeding motor is lack of phase, the motor can not operate normally.

Checking and solving methods:

1.check the material shaft, whether material is used up or there is a knot.

2.heating nozzle, exit material , check whether the material is broken or deformation. If the material is broken or deformation,cut the section.

3.check whether the printing material temperature is correct.

4.check whether the cooling fan for throat is working well.

5.before feeding, check whether the feeding motor is working well, whether there is material debris on the feed gear. If the motor is not operating properly check the motor and cable. If the feed gear is filled with material debris , please clean up the debris.

6.feed material by hand to remove debris.

7.if the material can not be squeezed out, you need to use the tool to clear the nozzle or directly replace the nozzle.

8.if the material is not extrusion, replace throat.

Cause analysis:

1.Hindered movement of nozzle

1.Filament knotted . if the filament is knotted in the printing process, the knoted filament can not be fed into the feeder. Meanwhile, the filament will pull the feeder and prevent the nozzle from moving according to the original route. In this case, the rest part of the model will be dislocated.

2.Touch the moving nozzle in the printing process.

3.If the top layer of printing is not smooth as the surface bulged,as the printing process proceeds,the bulge will accumulate repeatedly. As it accumulates to a certain extent, the bulge will prevent the nozzle from correct movement, which will cause the motor losing step and maiposition.

2.Moving resistance in the X or Y axis direction leads motor losing step

3.Glass platform moves during printing process.

4.x/y shaft belt or synchronous wheel loose. HORI 3D printer using a belt to drive the motor,.in order to control the location of the nozzle. Belts are made of rubber, and some kind of fiber is added for gaining strength . After a long time service, the belt may become flexible , and then affect the tension of belt drive head of. If the tension is not enough, the belt may slip on the synchronous wheel, which means the synchronous wheel runs, but the belt does not move. If the belt is too tight, it can cause problems. Excessive tension of the belt will cause excessive friction between the bearings, thereby impeding the motor rotation. Ideally, the belt is tight enough to prevent slipping, but it's not too tight, so that it prevents the system from running. If you are dealing with dislocation problem, you need to make sure that all of the synchronous belt tension is appropriate, not too loose or too tight.

5.synchronous wheel jackscrews lock the synchronous wheel on the shaft of the motor, so that both of them can synchronously rotate. Therefore, if the jackscrew is loose, the synchronous wheel will not rotate with the motor shaft. This means that it is possible for the motor to rotate, while the synchronous wheel and belt are not moving. In this case, the nozzle will not reach the predetermined location, which will lead to the malposition of the next layer. So, if the layer dislocation problem repeatedly occur, you need to check if all fasteners on the motor are tightened.

6.The jack screws of coupling is loose. The Coupling connects the Y shaft motor and the Y shaft driving light pole. If the screws are loose, The Y axis motor rotates while the Y shaft rod without movement, so that if is unable to drive the synchronous wheel move at the same time, also causes the malposition.

Checking and solving methods:

1.Check whether the glass platform is fixed, if not please use the shelf or the masking tape to fix it, or check if the magnet suctions on the glass is intact, if any of them falls off please use glue to repair.

2.Check whether the material tray supplier is blocked, if the filament is knoted, please open it or replace the filament directly.

3.Check if the surface of the model is bulged as the nozzle may bump into the bulge .sometimes.The cause of bulge sometimes is the the edge of model is too thin, and if it is not cooled timely, it will upwarp.And after cooling,there will be a bulge that is higher than the printing surface.So during the model design it is suggested to avoid any edge which is too thin, if this kind of situation appears, please speed up the cooling fan to cool the layers in time, or the attempt to place the model with another angle in order to avoid the bumping between the nozzle and possible bulge.

4.Observation the direction of malposition. Move the nozzle in this position by hand to see if there is any mobile resistance; If there is, please clean the rob with alcohol. If there is resistance after cleaning,Please adjust the fixing screw of the axis,.For sometimes if the axis is not parallel, it will block the movement of the nozzle. If the problem can not be solved by adjusting the axis, please check the tension of the belt on both sides of the direction and the screws of the synchronous wheel and the coupling. If the tension of both sides of the belt is too large, too small or not same, please adjust the belt tension and If the screws of top synchronous wheel and coupling are loose, please tighten.

Cause analysis:

1.Upwarp is because of the shrinkage of filament during the cooling process.When the operating area is not large, the effect of shrinkage is not obvious. But when printing large works, the shrinkage per unit area accumulates will generate inward force, which will get stronger and causing upward.

Checking and solving methods:

1.When slicing

1.Use Raft 2(prevent upwarp)

2.Extend edge

2.When printing

1.Use glue

2.Use heat-bed

3.During the process of printing， maintain a constant room temperature, try not to place the printer in the ventilative place, or to keep the printer chassis closed.

4.Platform leveling.The distance between nozzle and platform is important to the quality of the very first layer.If the distance is too large,the first layer may not stick on the platform;While if the distance is too small,the flow of filament will be hindered.Both of the situation affects the prnting quality of the first layer.

Cause analysis:

1.During the printing process, the nozzle will move around,at a certain plane it does not need extruding filament all the time，when nozzle moves from A point to B point and at the same time there is no filament extruded,Due to incomplete solidification and the viscosity of the melted filament,There could be some strings between A and B.If idle running increases,the possibility of stringing is more likely.

Checking and solving methods:

1.Use the back-pumping setting of the slicing software to set a proper amount. When nozzle leaves A point, the feeder will rollback and withdraw the filament and the feeder motor will move forward again and accelerate feeding speed. when the nozzle reaches B point. When the nozzle reaches B point, it will feed again.

Cause analysis:

1.The first layer of FDM printing is supposed to be closely stuck with the platform, which is very important. Only in this way, the next layer can be built on this basis. If the first layer does not stick on the platform, it will easily lead to the breaking away of the whole model.

1.If the print platform is out-of-level or distant from the nozzle, the material can not be firmly guled on the platform, together with the uneven shrinkage of the filament, will result in the model breaking away from the platform off.

2.Print platform is not clean, dusty, greasy and so on

2.When printing model of large basal area, if do not use glue or heating bed, due to the uneven shrinkage of the material, it is easy to upwarp. When warping is very serious, the model will break away of the platform.

An object with large floor space and altitude could be knock down by nozzle when it reaches a certain height.

Checking and solving methods:

1.Clean the platform before printing and adjust the platform to have a proper distance between the nozzle and platform. If the glass of platform is damaged so that t=it can not reach full level,Please use heel-piece to counteract.

2.When printing a model with large floor space,please use glue on the platform before printing and adjust the heat bed temperature according to different material.ABS：80℃-110℃ PLA：30℃-60℃

3.When printing model with small floor space,please set the “layer extension breadth”. The small the floor space,the higher the setup parameter.

Cause analysis:

1.The value of Layer height setting is too large. The layer height setting is limited by the size of nozzle.The layer height must be smaller than the size of nozzle, normally by 20%.

2.Printing temperature is too low. Only if the mobility and viscidity of the material reaches to a certain degree under a proper temperature, together with the extrusion force of the extruder,the material can stick on the previous layer；If not, the cracking will occur.because of insufficient temperature.For PLA the temperature should reach 210℃ while for ABS it should reach 240℃.

Checking and solving methods:

1.Pay attention to the size of the extruder and make sure that the layer height must be smaller the it by 20%.

2.Make sure the printing temperature is proper for different material.

Cause analysis:

1.If the angle between any side of the model and vertical line larger than 45°，due to gravity,the melted filament may hang down before it solidified.

Checking and solving methods:

1.To add support.

Cause analysis:

1.If the nozzle,heating block or the throat was not fastened,melted filament may leak out from possible gap.

Checking and solving methods:

1.If leakage occurs after the replacement of nozzle, please try to raise the heating temperature to melt the material then fasten nozzle.If it happens after the replacement of throat,please try to clean the throat and re-install it.

Cause analysis:

1.The phenomenon appeared when the model filling rate and the top layer thickness are lower.

Checking and solving methods:

1.When the print to the top layer,transfer the fan to the highest speed.

2.Ensure that the model of the upper should have enough thickness, general guarantee the model top side three layers.

Cause analysis:

1.The re-feeding of material after pump-back is not in time. The material supply at the initial spot could be less or more.

Checking and solving methods:

1.Make sure the surface layer structure at least has 2 layers by slicing setting.