Frequently Asked Questions
Order Issues
Where do you ship from?
We have warehouses in the US, AU and CA and ship from local warehouses. We can't ship cross-county. please choose your receingcountry at the top of the store [Country] before shopping. Thanks!
When do you replenish your stock?
Our restocking cycle is usually 2-3 months. Please contact us for detailed dates.We accept pre-order, if you want to pre-order, please contact us. kosen@kosenplastic.com
Extruder Clogging
Reason: The printer chamber temperature is too high, causing the material to soften and compress at the extrudergear, resulting in clogging
Solution: When prntng wth PLA. PETG, and other low-temp materals, keep the printer chamber door open Note: In hot summer weaher, It'srecommended to use air conditioning while printing
Reason:Material is too soft and deforms under pressure at the extruder gear
Solution: When printing flexble materals like TPU or TPE, reduce print speed and retraction distance. Its bestto use direct-drive extrusion forsuch materials
Reason:Extruder gear is worn out, or the tension is too tight or too loose, causing it to either fail to grip or overlysqueeze and deform the filament
Solution:Check for excessive wear on the extruder gear. Replace i worn, and adjust gear tension appropriately
Reason:Filament diameter is too large or too small, preventing smooth passage through the extruder gear
Solution: Measure the flament diameter. If deviation is too large, replace with a filament of consistent diameter
Nozzle Clogging
Reason:Nozzle wear
Solution: Extended use or abrasrve materials lke carbon fber can cause buldup and wear inside the nozzle. Regular ceaning is necessary.Use a hardened steel nozzle for carbon fiber. If unclogging fails, replace the nozzle
Reason: Printing too fast causes the nozzle to lag behind extrusion speed, leading to material buildup and blockage
Solution:Reduce print speed, increase nozzle temperature to improve material flow
Reason:Insufficient printing temperature prevents proper melting, causing clogging
Solution: Check that the temperature is correctly set for the material in use. If incorrect increase the nozzle temperature accordingly
Warping at the Bottom of the Print
Reason: First layer gap too large
Solution: The gap between the nozzle and the build plate is too large, causing the extruded ines of the first layer to not be squshed propery.resuting in poor adhesion. Re-level the bed and reduce the nozzle-to-bed gap, or lower the first layer height in the slicer setings
Reason:Excessive material shrinkage
Solution: Materials like ABs, PA, and PC shrink significanty.As the print gets taller, shrinkage can cause the edges to ift. The larger the print
and the lower the ambient temperature, the more likely it is to warp.1.Close the printer enclosure to maintain a stable internal temperature and minimize shrinkage effects.2. Apply adhesve (glue stick etc.)to the buld plate when printing wth shrink-prone materials lke ABS. PA or PC. This Increases bed adhesionand helps prevent warping caused by shrinkage.
Reason: Build plate temperature is too low
Solution: Each material requires a specic bed temperature. Ifthe bed temperature is too low. prints may not adhere propery.Increase the bedtemperature according to the material around 60°C for PLA. 100°C for ABS, and 0°C for PETG. Using PLA settings for ABS. for example, wilcause adhesion failure. The bed temperature should generally be higher than the material's heat defiection temperature
Sagging on Overhangs and Bridges
Reason: Build plate temperature is too low
Solution: Each material requires a specic bed temperature. Ifthe bed temperature is too low. prints may not adhere propery.Increase the bedtemperature according to the material around 60°C for PLA. 100°C for ABS, and 0°C for PETG. Using PLA settings for ABS. for example, wilcause adhesion failure. The bed temperature should generally be higher than the material's heat defiection temperature
Inconsistent Surface Gloss on the Print
Reason:Significant variation in print speed
Solution:Higher printing speeds tend to reduce surface gloss. When surface print speeds vary grealy across the model. glos inconsistenciesappear - especially on slower overhang areas. Testing shows that speeds above -8omm/s noticeably reduce gloss.Disable speed reduction features, and ty to keep surtace print speeds consistent to reduce gloss variations.
Stringing
Reason:Moisture in the filament
Solution: Moist filaments generate steam when heated, disrupting flow and causing stringing.
1. Dry the filament before printing, especially hygroscopic ones like PA and TPU. Use a dry box during printing.
2.Lower the nozzle temperature to reduce vaporization and improve stringing issues.
Reason:Insufficient Retraction
Solution: Heated material at the nozzle fows easiy, so retraction is needed to pullit back and prevent oozing. Ifretraction is insufcient, thefilament won't retract completely and will ooze out, causing stringing.Increase retraction distance and speed. Disable Z-hop during retraction.
Reason:Excessive temperature
Solution:The higher the temperature, the lower the viscosity, and the greater the fow. Overheating makes the filament more prone to oozingand stringing
Lower the nozzle temperature during printing.
(Note: For foaming materials, heating at the nozzle causes expansion, making retraction ineftective. To minimize stinging. reduce travel moves
instead.)
Interlayer Delamination or Cracking
Reason:Cooling too fast
Solution: If cooling s too rapid during printing, extruded layers wont bond properiy. leading to weak layer adhesion or even cracks. This Is morepronounced with high-shrinkage materials like ABS and PA, which require an enclosed and heated environment.1. Reduce cooling speed. Slower cooling improves interlayer bonding and strength.2. Increase print temperature. Higher temperatures improve melt flow and layer bonding.
Reason: The ceiling is too high
Solution:When layer helght is too nhigh, the extruded lines dont flatten properly, resuting in poor bonding between layers.Lower the layerheight. Recommended height is 1/4 to 3/4 of the nozzle diameter, with 1/2 being ideal for balancing strength and print time.
Reason:Under-extrusion
Solution: Inadequate extrusion causes weak layer bonding.
1. Increase extrusion multiplier or flow rate.
2. Raise nozzle temperature to improve material flow and extrusion volume3. Replace the nozzle if it is worn and restricting flow.
Reason: Material has inherently low strength
Solution: Lightweight and silk-like materials have lower structural strength due to their visual and physical properties.Avoid using low-strength materials for functional or load-bearing prints
Missing Layers or Gaps in Print
Reason: Print speed too fast
Solution: If print speed is too fast the extruder can'tkeep up with the nozzle movement, resulting in under-extrusion or gaps. Lower the printspeed to allow consistent extrusion.
Reason: Insufficient temperature
Solution: Lowtemperature reduces material tow.leading to under-extrusion and gaps. Use the corecttemperature for each material - forexample. printing PETG or ABS at PLAtemperaure wll cause under-extrustion. Increase the nozzle temperature to improve materal ow. Forhigh-speed printing, raise the temperature by 10-20°C over normal settings.
Reason: Worn or clogged nozzle
Solution: A worn nozzle may have a smaller diameter, reducing extrusion volume.Clean or replace the nozle regulary, especialy when switching between materials. For abrasive flaments like carbon fiber, use nardened steenozzles to avoid rapid wear.
Tip Deformation (Pointy Parts Warping)
Reason: Inadequate cooling
Solution: Small pointed features don't cool quickly enough and are prone to deformation.
1. Increase cooling. Set auxiliary fans to maximum or use external fans if needed.
2. Slow down the print speed, ideally below 30mm/s, to allow sufficient cooling time.
First Layer Not Sticking
Reason: First layer gap too large
Solution: If the nozzle is too far from the bed, the first layer lines won't be squished and won't adhere properiy.Re-level the bed. reduce thenozzle-to-bed gap, or decrease the first layer height.






